From the early Church Fathers to now.
1 Patristic · 1 Jewish · 2 Catholic · 1 Reformed
“May the Lord hear thee in the day of tribulation: may the name of the God of Jacob protect thee.”
“"Send You help from the Holy, and from Sion defend You" [Psalm 20:2]. Making for You a sanctified Body, the Church, from watching safe, which waits when You shall come from the wedding.”
“May the Lord answer you on a day of distress This psalm was [composed] because he [David] would send Joab and all Israel to war, and he would stand in Jerusalem and pray for them, as the matter is stated (in II Sam. 18:3): “It is better that you be for us from the city as aid.” Were it not for David, Joab would not have succeeded in battle. the name of the God of Jacob Who promised him [Jacob] when he went to Haran and kept His promise; therefore, it is stated: “the God of Jacob.””
“The second cause: "May he send you help from the sanctuary," that is, from the assembly of the saints. And there is a twofold assembly of the saints. One reigning with God in glory; the other fighting on earth; and from both we are helped, because the Angels intercede for us: 1 Jn. 2: "We have an advocate," namely, the assembly of Angels: Rev. 8: "The smoke of the incense from the prayers of the saints ascended from the hand of the Angel before God." Smoke comes from moisture and heat. Likewise Christ, who is their king, stands before God on our behalf: Heb. 7: "Approaching through himself to God, to intercede for us." And therefore he says, "May he send you help from the sanctuary," that is, from the incarnate Son, who in the anagogical sense is called holy; Lk. 1: "The Holy One who shall be born of you shall be called the Son of God": Dan. 9: "The Holy One of holy ones shall be anointed." Or "from the sanctuary," that is, from Christ who suffered, because in his passion he sanctified himself for us: Jn. 17: "For them I sanctify myself, that they also may be sanctified in truth": 1 Sam. 11: "Tomorrow salvation shall be yours when the sun grows hot." Or "May he send you help from the sanctuary," namely from the assembly of the blessed: Ps. 21: "But you dwell in the holy place." "And from Zion may he defend you." Zion, that is, "watchtower," that is, from the citadel of David, where the ark was; there God was worshiped then; as if to say: through the prayers of those who contemplate heavenly things in this world, may he defend you, that is, make you safe. Or conversely, "from the sanctuary," namely the assembly of those who are in the world; and "from Zion," namely those who are in glory. "May he defend you." Or "from the sanctuary," as regards those who are in the active life. And "from Zion," as regards those who are in the contemplative life -- by the prayers of all of these, "may he defend you."”
“Hear thee, the Ruler; or Jesus Christ praying for his people. (Worthington) — Tribulation. War is always such. The victors themselves suffer, and many souls perish. (Calmet) — Name. The Messias, as the Jews often explain the expression, (Hooke, Prin.) or God himself, as others have it. Nomen ejus ipse. (Calmet) — The blessed Trinity is all one God. The name of the Lord is a strong tower, &c., Proverbs xviii. 10. It was made known to Moses, to give him confidence, Exodus iii. 13. (Haydock) — Great was the honour conferred on the patriarchs, that God should be styled the God of Abraham, &c.! But ours is not less, since we are authorized to call Him Our Father. [Matthew vi. 9.] (Berthier)”
“strengthen thee--sustain in conflict; even physical benefits may be included, as courage for war, &c., as such may proceed from a sense of divine favor, secured in the use of spiritual privileges.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.