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Philippians 4:6 (WEB)
In nothing be anxious, but in everything, by prayer and petition with thanksgiving, let your requests be made known to God.

Catechism · 1

§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.

John Cassian, Conferences I–X IX.17Conference IX
“…the fervour of a single prayer, saying as follows: “But in everything by prayer and supplication with thanksgiving let your requests be made known unto God.”” — editor's note: Phil. iv. 6.
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Augustine of Hippo, Expositions on the Psalms Psalm 47
“Justly then the Apostle so addressed us, “The Lord is at hand; be careful for nothing.”” — editor's note: Phil. iv. 5, 6.
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Athanasius of Alexandria, Festal and Personal Letters Festal Letters.3Festal Letters
“For the blessed Apostle, who gave thanks at all times, urges us in the same manner to draw near to God saying, ‘Let your requests, with thanksgiving, be made known unto God.’” — editor's note: Phil. iv. 6.
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John Chrysostom, Homilies on Hebrews Homily 1
“For as he says also in another place, “The Lord is at hand, be careful for nothing” ( Philip. iv. 5, 6 ), and again, “For now is our salvation nearer than when we believed” ( Rom. xiii. 11 ): so also here.” — the author cites it
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John Chrysostom, Homilies on Hebrews Homily 19
“And again in other places, “The Lord is at hand; be careful for nothing.” ( Philip. iv. 5, 6.)” — the author cites it
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John Chrysostom, Homilies on John Homily 33
“Wherefore also Paul said, “The Lord is at hand: be careful for nothing.” ( Philip. iv. 5, 6.)” — the author cites it
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John Chrysostom, Homilies on Matthew Homily 71
“The Lord is at hand, be careful for nothing;”and again, “The fashion of this world passeth away.”” — editor's note: Phil. iv. 5, 6.
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John Chrysostom, Homilies on Matthew Homily 74
“For in proof that He doth not tarry, hear Paul saying, “The Lord is at hand, be careful for nothing;”and, “He that cometh will come, and will not tarry.”” — editor's note: Phil. iv. 5, 6.
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Basil the Great, Letters Letter 226
““I am careful for nothing.”” — editor's note: Phil. iv. 5 and 6.
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Tertullian, On Prayer Chapter 11
“For what sort of deed is it to approach the peace of God without peace? the remission of debts while you retain them?” — editor's note: Perhaps there may be an allusion to Phil. iv. 6, 7.
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