Catena Fidei

1 Thessalonians 5:18 (WEB)
In everything give thanks, for this is the will of God in Christ Jesus toward you.

Catechism · 2

§2633Article 3 · In the Age of the ChurchRead at vatican.va
“It is with this confidence that St. James and St. Paul exhort us to pray at all times.” — Catechism footnote: Cf. Jas 1:5-8; Eph 5:20; Phil 4:6-7; Col 3:16-17; 1 Thess 5:17-18.
§2638Article 3 · In the Age of the ChurchRead at vatican.va
“…thanks in all circumstances; for this is the will of God in Christ Jesus for you"; "Continue steadfastly in prayer, being watchful in it with thanksgiving."” — Catechism footnote: 1 Thess 5:18; Col 4:2.

Athanasius of Alexandria, Against the Arians III.7Discourse III
“Therefore the Will of God concerning all things, whether they be begotten again or are brought into being at the first, is in His Word, in whom He both makes and begets again what seems right to Him; as the Apostle again signifies, writing to Thessalonica; ‘for this is the will of God in Christ Jesus concerning you.’” — editor's note: 1 Thess. v. 18.
Read the whole comment
Athanasius of Alexandria, Festal and Personal Letters Festal Letters.9Festal Letters
“So Paul wishing us to be ever in this disposition, commands, saying, ‘Rejoice evermore; pray without ceasing; in everything give thanks.’” — editor's note: 1 Thess. v. 16–18
Read the whole comment
Athanasius of Alexandria, Festal and Personal Letters Festal Letters.15Festal Letters
“In this manner the blessed Paul, when he took pleasure in infirmities, in reproach, in necessities, in persecutions, and in distresses for Christ, rejoiced, and wished all of us to rejoice saying, ‘Rejoice always; in everything give thanks.’” — editor's note: 1 Thess. v. 18.
Read the whole comment

Tertullian, Apology Chapter 46
“If equanimity be the contention, you have Lycurgus choosing death by self-starvation, because the Lacons had made some emendation of his laws: the Christian, even when he is condemned, gives thanks.” — editor's note: [John xxi. 19. A pious habit which long survived among Christians, when learning that death was at hand: as in Shakespeare’s Henry IV., “Laud be to God, ev’n…
Read the whole comment

Gregory of Nazianzus, Orations Oration 7
“…present and in the future, upon those who truly love Him; bearing all things, enduring all things for their love and hope of Him, giving thanks for all things favourable and unfavourable alike: I mean pleasant and painful, for reason knows that even these are often instruments of salvation; commending to Him our own…” — editor's note: 1 Thess. v. 18.
Read the whole comment