1 Mt 19:16-19.
2 Mt 19:21.
3 Cf. Mt 5:17.
4 Cf. Mt 19:6-12, 21, 23-29.
5 Mt 5:20.
6 Cf. Mt 5:46-47.
7 Mt 5:21-22.
8 Mt 22:36.
9 Mt 22:37-40; cf. Deut 6:5; Lev 19:18.
10 Rom 13:9-10.
11 Ex 34:28; Deut 4:13; 10:4.
12 Ex 31:18; Deut 5:22.
13 Cf. Deut 31:9. 24.
14 Cf. Ex 20:1-17.
15 Cf. Deut 5:6-22.
16 Cf. for example Hos 4:2; Jer 7:9; Ezek 18:5-9.
17 Deut 30:16.
18 Deut 5:15.
19 Deut 5:22.
20 Ex 25:16; 31:18; 32:15; 34:29; 40:1-2.
21 Deut 5:4.
22 Cf. Ex 19.
23 Cf. Ex 24:7.
24 Deut 5:2.
25 Origen, Hom. in Ex. 8,1: PG 12, 350; cf. Ex 20:2; Deut 5:6.
26 St. Irenaeus, Adv. haeres., 4, 16, 3-4: PG 7/1, 1017-1018.
27 St. Augustine, Sermo 33, 2, 2: PL 38, 208.
28 Cf. DS 1569-1570.
29 LG 24.
30 Cf. Jas 2:10-11.
31 St. Irenaeus, Adv. haeres. 4, 15, 1: PG 7/l, 1012.
32 St. Bonaventure, Comm. sent. 4, 37, 1, 3.
33 Jn 15:5.
34 Jn 15:12.

CHAPTER ONE

1 Mt 22:37; cf. Lk 10:27:". . . and with all your strength."
2 Deut 6:4.
3 Ex 20:2-5; cf. Deut 5:6-9.
4 Mt 4:10.
5 Deut 6:13-14.
6 Cf. Ex 19:16-25; 24:15-18.
7 St. Justin, Dial. cum Tryphone Judaeo 11, 1: PG 6, 497.
8 Roman Catechism 3, 2,4.
9 Rom 1:5; 16:26.
10 Cf. Rom 1:18-32.
11 CIC, can. 751: emphasis added.
12 Cf. Deut 6:4-5.
13 Lk 4:8; Cf. Deut 6:13.
14 Cf. Lk 1:46-49.
15 Lk 18:1.
16 St. Augustine, De civ Dei 10, 6 PL 41, 283.
17 PS 51:17.
18 Cf. Am 5:21-25; Isa 1:10-20.
19 Mt 9:13; 12:7; Cf. Hos 6:6.
20 Cf. Heb 9:13-14.
21 CIC, can. 1191 # 1.
22 Cf. Acts 18:18; 21:23-24.
23 Cf. CIC, can. 654.
24 LG 42 # 2.
25 Cf. CIC, cann. 692; 1196-1197.
26 DH 1 # 2.
27 DH 2 # 1.
28 NA 2 # 2.
29 DH 14 # 4.
30 DH 1 # 3.
31 AA 13 # 1.
32 Cf. DH 1.
33 Cf. AA 13; Leo XIII, Immortale Dei 3, 17; Pius XI, Quas primas 8, 20.
34 DH 2 # 1.
35 DH 2 # 2.
36 DH 6 # 3.
37 Cf. Leo XIII, Libertas praestantissimum 18; Pius XII AAS 1953, 799.
38 Cf. DH 2.
39 Cf. Pius VI, Quod aliquantum (1791) 10; Pius IX, Quanta cura 3.
40 DH 7 # 3.
41 Cf. Mt 23:16-22.
42 Ps 115:4-5, 8; cf. Isa 44:9-20; Jer 10:1-16; Dan 14:1-30; Bar 6; Wis 13: 1-15:19.
43 Josh 3:10; Ps 42:3; etc.
44 Mt 6:24.
45 Cf. Rev 13-14.
46 Cf. Gal 5:20; Eph 5:5.
47 Origen, Contra Celsum 2, 40: PG 11, 861.
48 Cf. Deut 18:10; Jer 29:8.
49 Cf. Lk 4:9.
50 Deut 6:16.
51 Cf. 1 Cor 10:9; Ex 17:2-7; Ps 95:9.
52 Cf. CIC, cann. 1367; 1376.
53 Cf. Acts 8:9-24.
54 Acts 8:20.
55 Mt 10:8; cf. already Isa 55:1.
56 CIC, can. 848.
57 Mt 10:10; cf. Lk 10:7; 2 Cor 9:5-18; 1 Tim 5:17-18.
58 GS 19 # 1.
59 GS 20 # 2.
60 GS 20 # 2.
61 Cf. Rom 1:18.
62 GS 19 # 3.
63 Cf. GS 20 # 1.
64 GS 21 # 3.
65 GS 21 # 7.
66 Deut 4:15-16.
67 Sir 43:27-28.
68 Wis 13:3.
69 Cf. Num 21:4-9; Wis 16:5-14; Jn 3:14-15; Ex 25:10-22; 1 Kings 6:23-28; 7:23-26.
70 St. Basil, De Spiritu Sancto 18, 45: PG 32, 149C; Council of Nicaea II: DS 601; cf. Council of Trent: DS 1821-1825; Vatican Council II: SC 126; LG 67.
71 St. Thomas Aquinas, STh II-II, 81, 3 ad 3.
72 Ex 20:7; Deut 5:11.
73 Mt 5:33-34.
74 Cf. Zech 2:13; Ps 29:2; 96:2; 113:1-2.
75 John Henry Cardinal Newman, Parochial and Plain Sermons V, 2 (London: Longmans, Green and Co., 1907) 21-22.
76 Cf. Mt 10:32; 1 Tim 6:12.
77 Cf. 1 Jn 1:10.
78 Jas 2:7.
79 Cf. CIC, can. 1369.
80 St. Augustine, De serm. Dom. in monte 2, 5, 19: PL 34, 1278.
81 Deut 6:13.
82 Mt 5:33-34,37; Cf. Jas 5:12.
83 Cf. 2 Cor 1:23; Gal 1:20.
84 CIC, can. 1199 # 1.
85 Mt 28:19.
86 CIC, Can. 855.
87 Cf. Isa 43:1; Jn 10:3.
88 Rev 2:17.
89 Rev 14:1.
90 Ex 20:8-10; cf. Deut 5:12-15.
91 Mk 2:27-28.
92 Ex 31:15.
93 Ex 20:11.
94 Deut 5:15.
95 Cf. Ex 31:16.
96 Ex 31:17; cf. 23:12.
97 Cf. Neh 13:15-22; 2 Chr 36:21.
98 Cf. Mk 1:21; Jn 9:16.
99 Mk 2:27.
100 Cf. Mk 3:4.
101 Cf. Mt 12:5; Jn 7:23.
102 Mk 2:28.
103 Ps 118:24.
104 Cf. Mt 28:1; Mk 16:2; Lk 24:1; Jn 20:1.
105 Cf. Mk 16:1; Mt 28:1.
106 St. Justin, I Apol. 67: PG 6, 429 and 432.
107 Cf. 1 Cor 10:11.
108 St. Ignatius of Antioch, Ad Magn. 9, 1: SCh 10, 88.
109 St. Thomas Aquinas, STh II-II 122, 4.
110 CIC, can. 1246 # 1.
111 CIC, can. 1246 # 2: "The conference of bishops can abolish certain holy days of obligation or transfer them to a Sunday with prior approval of the Apostolic See."
112 Cf. Acts 2:42-46; 1 Cor 11:17.
113 Heb 10:25.
114 Sermo de die dominica 2 et 6: PG 86/1, 416C and 421C.
115 CIC, can. 515 # 1.
116 St. John Chrysostom, De incomprehensibili 3, 6: PG 48, 725.
117 CIC, can. 1247.
118 CIC, can. 1248 # 1.
119 Cf. CIC, can. 1245.
120 CIC, can. 1248 # 2.
121 Gen 2:2.
122 Cf. GS 67 # 3.
123 Cf. CIC, can. 120.
124 St. Augustine, De civ. Dei 19, 19: PL 41, 647.
125 Heb 12:22-23.

CHAPTER TWO

1 Jn 13:34.
2 Mk 12:29-31; cf. Deut 6:4-5; Lev 19:18; Mt 22:34-40; Lk 10:25-28.
3 Rom 13:8-10.
4 Ex 20:12; Deut 5:16.
5 Lk 2:51.
6 Mk 7:8-13.
7 Eph 6:1-3; cf. Deut 5:16.
8 Ex 20:12; Deut 5:16.
9 FC 21; cf. LG 11.
10 Cf. Eph 5:21b: 4; Col 3:18-21; 1 Pet 3:1-7.
11 GS 52 # 1.
12 Jas 1:27.
13 Cf. GS 47 # 1.
14 GS 52 # 2.
15 Cf. FC 46.
16 Cf. Eph 314.
17 Cf. Prov 1:8; Tob 4:3-4.
18 Cf. Ex 20:12.
19 Sir 7:27-28.
20 Prov 6:20-22.
21 Prov 13:1.
22 Col 3:20; Cf. Eph 6:1.
23 Cf. Mk 7:10-12.
24 Sir 3:2-6.
25 Sir 3:12-13, 16.
26 Prov 17:6.
27 Eph 4:2.
28 2 Tim 1:5.
29 GE 3.
30 Cf. FC 36.
31 CA 36 # 2.
32 Sir 30:1-2.
33 Eph 6:4.
34 LG 11 # 2.
35 Cf. LG 11.
36 Cf. GS 48 # 4.
37 Cf. Mt 18:21-22; Lk 17:4.
38 Cf. GE 6.
39 Mt 10:37; cf. 16:25.
40 Mt 12:49.
41 Mt 20:26.
42 Cf. CA 25.
43 Cf. Rom 13:1-2.
44 1 Pet 2:13, 16.
45 Rom 13:7.
46 Ad Diognetum 5, 5 and 10; 6, 10: PG 2, 1173 and 1176.
47 1 Tim 2:2.
48 Mt 22:21.
49 Acts 5:29.
50 GS 74 # 5.
51 Cf. CA 45; 46.
52 GS 76 # 3.
53 GS 76 # 5.
54 Ex 20:13; Cf. Deut 5:17.
55 Mt 5:21-22.
56 CDF, instruction, Donum vitae, intro. 5.
57 Cf. Gen 4:8-12.
58 Gen 4:10-11.
59 Gen 9:5-6.
60 Cf. Lev 17:14.
61 Ex 23:7.
62 Mt 5:21.
63 Cf. Mt 5:22-39; 5:44.
64 Cf. Mt 26:52.
65 St. Thomas Aquinas, STh II-II, 64, 7, corp. art.
66 St. Thomas Aquinas, STh II-II, 64, 7, corp. art.
67 Cf. Lk 23:40-43.
67a John Paul II, Evangelium vitae 56.
68 Cf. Gen 4:10.
69 Cf. GS 51 # 3.
70 Cf. Am 8:4-10.
71 Cf. CDF, Donum vitae I, 1.
72 Jer 1:5; cf. Job 10:8-12; Ps 22:10-11.
73 Ps 139:15.
74 Didache 2, 2: SCh 248, 148; cf. Ep. Barnabae 19, 5: PG 2, 777; Ad Diognetum 5, 6: PG 2, 1173; Tertullian, Apol. 9: PL 1, 319-320.
75 GS 51 # 3.
76 CIC, can. 1398.
77 CIC, can. 1314.
78 Cf. CIC, cann. 1323-1324.
79 CDF, Donum vitae III.
80 CDF, Donum vitae III.
81 CDF, Donum vitae I, 2.
82 CDF, Donum vitae I, 3.
83 CDF, Donum vitae I, 5.
84 CDF, Donum vitae I, 6.
85 Mt 18:6; Cf. 1 Cor 8:10-13.
86 Cf. Mt 7:15.
87 Pius XII, Discourse, June 1, 1941.
88 Cf. Eph 6:4; Col. 3:21.
89 Lk 17:1.
90 Cf. DS 3722.
91 Cf. Tob 1:16-18.
92 Cf. CIC, can. 1176 # 3.
93 Mt 5:21.
94 St. Thomas Aquinas, STh II-II, 158, 1 ad 3.
95 Mt 5:22.
96 Mt 5:44-45.
97 St. Augustine, De civ. Dei, 19, 13, 1: PL 41, 640.
98 Cf. Isa 32:17; cf. GS 78 ## 1-2.
99 Isa 9:5.
100 Eph 2:16 J.B.; cf. Col 1:20-22.
101 Eph 2:14.
102 Mt 5:9.
103 Cf. GS 78 # 5.
104 Cf. GS 81 # 4.
105 GS 79 # 4.
106 Cf. GS 79 # 5.
107 Cf. GS 79 # 3.
108 GS 79 # 4.
109 GS 80 #3.
110 Cf. Paul VI, PP 53.
111 GS 78 # 6; cf. Isa 2:4.
112 EX 20:14; Deut 5:18.
113 Mt 5:27-28.
114 FC 11.
115 Gen 1:27.
116 Gen 1:28.
117 Gen 5:1-2.
118 FC 22; Cf. GS 49 # 2.
119 MD 6.
120 Gen 2:24.
121 Cf. Gen 4:1-2, 25-26; 5:1.
122 Mt 5:27-28.
123 Cf. Mt 19:6.
124 Cf. Mt 5:37.
125 Cf. Sir 1:22.
126 GS 17.
127 St. Augustine, Conf. 10, 29, 40: PL 32, 796.
128 Cf. Titus 2:1-6.
129 FC 34.
130 GS 25 # 1.
131 Cf. Gal 5:22.
132 Cf. 1 Jn 3:3.
133 Cf. Jn 15:15.
134 Gal 3:27.
135 CDF, Persona humana 11.
136 St. Ambrose, De viduis 4, 23: PL 16, 255A.
137 CDF, Persona humana 9.
138 CDF, Persona humana 9.
139 Cf. 1 Cor 6:15-20.
140 Cf. Gen 191-29; Rom 124-27; 1 Cor 6:10; 1 Tim 1:10.
141 CDF, Persona humana 8.
142 FC 11.
143 Tob 8:4-9.
144 GS 49 # 2.
145 Pius XII, Discourse, October 29,1951.
146 GS 48 # 1.
147 Cf. CIC, can. 1056.
148 Mk 109; cf. Mt 19:1-12; 1 Cor 7: 10-11.
149 St. John Chrysostom, Hom. in Eph. 20, 8: PG 62, 146-147.
150 FC 30.
151 HV 11.
152 HV 12; cf. Pius XI, encyclical, Casti connubii.
153 Cf. Eph 3:14; Mt 23:9.
154 GS 50 # 2.
155 GS 51 # 3.
156 Cf. HV 12.
157 HV 16.
158 HV 14.
159 FC 32.
160 GS 51 # 4.
161 Cf. HV 23; PP 37.
162 Cf. GS 50 # 2.
163 Gen 15:2.
164 Gen 30:1.
165 CDF, Donum vitae intro., 2.
166 CDF, Donum vitae II, 1.
167 CDF, Donum vitae II, 5.
168 CDF, Donum vitae II, 4.
169 CDF, Donum vitae II, 8.
170 Cf. Mt 5:27-28.
171 Cf. Mt 5:32; 19:6; Mk 10:11; 1 Cor 6:9-10.
172 Cf. Hos 2:7; Jer 5:7; 13:27.
173 Cf. Mt 5:31-32; 19:3-9; Mk 10 9; Lk 16:18; 1 Cor 7:10-ll.
174 Cf. Mt 19:7-9.
175 CIC, can. 1141.
176 Cf. CIC, cann. 1151-1155.
177 St. Basil, Moralia 73, 1: PG 31, 849-852.
178 Cf. FC 84.
179 FC 19; cf. GS 47 # 2.
180 Cf. Lev 18:7-20.
181 1 Cor 5:1, 4-5.
182 Cf. FC 81.
183 CDF, Persona humana 7.
184 Cf. FC 80.
185 EX 20:15; Deut 5:19; Mt 19:18.
186 Cf. Gen 1:26-29.
187 GS 69 # 1.
188 Cf. GS 71 # 4; SRS 42; CA 40; 48.
189 2 Cor 8:9.
190 Cf. GS 69 # 1.
191 Cf. Deut 25:13-16; 24:14-15; Jas 5:4; Am 8:4-6.
192 Lk 19:8.
193 Philem 16.
194 Cf. Gen 128-31.
195 Cf. CA 37-38.
196 Cf. Mt 6:26; Dan 3:79-81.
197 Cf. Gen 2:19-20; 9:1-4.
198 GS 23 # 1.
199 GS 76 # 5.
200 Cf. CA 3.
201 Cf. SRS 1; 41.
202 Cf. CA 24.
203 Cf. GS 63 # 3; LE 7; 20; CA 35.
204 GS 65 # 2.
205 Mt 6:24; Lk 16:13.
206 Cf. CA 10; 13; 44.
207 CA 34.
208 Cf. GS 64.
209 Cf. Gen 1:28; GS 34; CA 31.
210 2 Thess 3:10; Cf. 1 Thess 4:11.
211 Cf. Gen 3:14-19.
212 Cf. LE 27.
213 Cf. LE 6.
214 Cf. CA 32; 34.
215 Cf. LE 11.
216 CA 48.
217 Cf. CA 37.
218 Cf. LE 19; 22-23.
219 Cf. CA 48.
220 Cf. Lev 19:13; Deut 24:14-15; Jas 5:4
221 GS 67 # 2.
222 Cf. LE 18.
223 Cf. SRS 14.
224 SRS 9.
225 Cf. SRS 17; 45.
226 CA 28; Cf. 35.
227 Cf. SRS 16.
228 Cf. CA 26.
229 Cf. SRS 32; CA 51.
230 SRS 47 # 6; cf. 42.
231 Mt 5:42; 10:8.
232 Cf. Mt 25:31-36.
233 Mt 11:5; cf. Lk 4:18.
234 CA 57; cf. Lk 6:20-22, Mt 8:20; Mk 12:41-44.
235 Eph 4:28.
236 Cf. CA 57.
237 Jas 5:1-6.
238 St. John Chrysostom, Hom. in Lazaro 2, 5: PG 48, 992.
239 AA 8 # 5.
240 St. Gregory the Great, Regula Pastoralis. 3, 21: PL 77, 87.
241 Cf. Isa 58:6-7; Heb 13:3.
242 Cf. Mt 25:31-46.
243 Cf. Tob 4:5-11; Sir 17:22; Mt 6:2-4.
244 Lk 3:11.
245 Lk 11:41.
246 Jas 2:15-16; cf. 1 Jn 3:17.
247 CDF, instruction, Libertatis conscientia, 68.
248 Deut 15:11.
249 Jn 12:8.
250 Am 8:6; cf. Mt 25:40.
251 P. Hansen, Vita mirabilis (Louvain, 1668).
252 EX 20:16; Cf. Deut 5:20.
253 Mt 5:33.
254 PS 119:90; Cf. Prov 8:7; 2 Sam 7:28; PS 119:142; Lk 1:50.
255 Rom 3:4; Cf. PS 119:30.
256 Jn 1:14; 8:12; Cf. 14:6.
257 Jn 12:46.
258 Jn 8:32; Cf. 17:17.
259 Jn 16:13.
260 Mt 5:37.
261 DH 2 # 2.
262 St. Thomas Aquinas, STh II-II, 109, 3 ad 1.
263 St. Thomas Aquinas, STh II-II, 109, 3, corp. art.
264 1 Jn 1:6.
265 Jn 18:37.
266 2 Tim 1:8.
267 Acts 24:16.
268 Cf. Mt 18:16.
269 AG 11.
270 St. Ignatius of Antioch, Ad Rom. 4, 1 SCh 10, 110.
271 St. Ignatius of Antioch, Ad Rom. 6, 1-2 SCh 10, 114.
272 Martyrium Polycarpi 14,2-3 PG 5,1040; SCh 10,228.
273 Eph 4:24.
274 Eph 4:25; 1 Pet 2:1.
275 Cf. Prov 19:9.
276 Cf. Prov 18:5.
277 Cf. CIC, can. 220.
278 Cf. Sir 21:28.
279 St. Ignatius of Loyola, Spiritual Exercises, 22.
280 St. Augustine, De mendacio 4, 5: PL 40: 491.
281 Jn 8:44.
282 Cf. Sir 27:16; Prov 25:9-10.
283 CIC, Can. 983 # 1.
284 Cf. IM 11.
285 IM 5 # 2.
286 IM 8.
287 IM 12.
288 IM 12 # 2.
289 Wis 13:3, 5.
290 Wis 7:25-26.
291 Wis 7:29-30.
292 Wis 8:2.
293 Gen 1:26.
294 Cf. Wis 7:16-17
295 Cf. Pius XII, Musicae sacrae disciplina; Discourses of September 3 and December 25, 1950.
296 Heb 1:3; Col 2:9.
297 Cf. SC 122-127.
298 Ex 20:17.
299 Mt 5:28.
300 Cf. 1 Jn 2:16.
301 Cf. Gal 5:16, 17, 24; Eph 2:3.
302 Cf. Gen 3:11; Council of Trent: DS 1515.
303 John Paul II, DeV 55; cf. Gal 5:25.
304 Mt 15:19.
305 Pastor Hermae, Mandate 2, 1: PG 2, 916.
306 Mt 5:8.
307 Cf. 1 Tim 4:3-9; 2 Tim 2:22.
308 Cf. 1 Thess 4:7; Col 3:5; Eph 4:19.
309 Cf. Titus 1:15; 1 Tim 1:3-4; 2 Tim 2:23-26.
310 St. Augustine, Defide et symbolo 10, 25: PL 40, 196.
311 Cf. 1 Cor 13:12; 1 Jn 3:2.
312 Cf. Rom 12:2; Col 1:10.
313 Wis 15:5.
314 St. Augustine, Conf. 6, 11, 20: PL 32, 729-730.
315 GS 58 # 4.
316 Ex 20:17; Deut 5:21.
317 Mt 6:21.
318 Cf. 1 Jn 2:16; Mic 2:2.
319 Cf. Wis 14:12.
320 Roman Catechism, III, 37; cf. Sir 5:8.
321 Roman Catechism, III, 37.
322 Cf. 2 Sam 12:14.
323 Cf. Gen 4:3-7; 1 Kings 21:1-29.
324 Wis 2:24.
325 St. John Chrysostom, Hom. in 2 Cor. 27, 3-4 PG 61, 588.
326 Cf. St. Augustine, De catechizandis rudibus 4, 8 PL 40, 315-316.
327 St. Gregory the Great Moralia in Job 31, 45: PL 76, 621.
328 St. John Chrysostom, Hom. in Rom. 71, 5: PG 60, 448.
329 Gen 3:6.
330 Cf. Rom 7:7.
331 Rom 7:23; cf. 7:10.
332 Rom 3:21-22.
333 Gal 5:24; cf. Rom 8:14, 27.
334 Lk 14:33; cf. Mk 8:35.
335 Cf. Lk 21:4.
336 LG 42 # 3.
337 Mt 5:3.
338 Cf. Lk 6:20.
339 St. Gregory of Nyssa, De beatitudinibus 1: PG 44, 1200D; cf. 2 Cor 8:9.
340 Lk 6:24.
341 St. Augustine, De serm. Dom. in monte 1, 1, 3: PL 34, 1232.
342 Cf. Mt 6:25-34.
343 St. Gregory of Nyssa, De beatitudinibus 6: PG 44, 1265A.
344 Cf. Rev 22:17.
345 St. Augustine, De civ. Dei, 22, 30: PL 41, 801-802; cf. Lev 26:12; cf. 1 Cor 15:28.