Ps 30:3

“"For You are My strength, and My refuge" [Psalm 31:3]. For You are unto Me My strength to bear My persecutors, and My refuge to escape them. "And for Your Name's sake You shall be My guide, and shall nourish Me." And that by Me You may be known to all the Gentiles. I will in all things follow Your will; and, by assembling, by degrees, Saints unto Me, You shall fulfil My body, and My perfect stature.”

“Then when he says, "For you are," he shows what moves him. First, to hope. Second, to pray, at "Have mercy on me, O Lord, for I am afflicted." Concerning the first he does two things. For first he is moved to hope from the consideration of the divine condition. Second, from the experience of benefits, at "But I have hoped in the Lord." For these two things give confidence. He shows the condition of God in two ways. First, by comparison to us; second, by comparison to adversaries, because there were both adversaries and enemies, at "You have hated those who observe." Concerning the first he does three things. First, he sets forth God's relation to us; second, what he hopes from this, at "And for your name's sake." Third, raised up in hope, he breaks forth in prayer, at "Into your hands." Now it should be known that God has a relation to us because he is our strength for accomplishing all the good things that we do through him. Ex. 15: "The Lord is my strength and my praise," and so on. Likewise, because he is our refuge for avoiding evils. Ps. 103: "The rock" (namely God) "is a refuge for hedgehogs." And therefore he says, I hope in you because of these two things. And what he hopes for, he shows in the person of a wayfarer, because he always needs a guide, a provider, and a defender. The first pertains to the way; the second to life; the third to safety. And therefore as to the first he says, "You will lead me," namely along the way of salvation. As to the second, "And you will nourish me," with the nourishment of virtues, and also with bodily nourishment. Ps. 22: "The Lord rules me, and I shall want nothing." As to the third, "You will bring me out of the snare," that is, from the deceitful ambush, which they have prepared for me. Prov. 1: "Come with us, let us lie in wait," and so on. Ps. 123: "The snare is broken." And the reason is that you are my protector; as if to say, I hope because you will do these things for me, because you are my protector.”