Ps 41:11

“I beseech you to remember in all your present contest the great reward laid up in heaven for those who are persecuted and reviled for righteousness' sake, and to be glad and leap for joy on account of the Son of man, just as the apostles once rejoiced when they were counted worthy to suffer dishonor for his name. And if you should ever perceive your soul drawing back, let the mind of Christ, which is in us, say to it, when it wishes to trouble that mind as much as it can, "Why are you sorrowful, my soul, and why do you disquiet me? Hope in God, for I shall yet give him thanks." I pray that our souls may never be disquieted, and even more that in the presence of the tribunals and of the naked swords drawn against our necks they may be guarded by the peace of God, which passes all understanding, and may be quieted when they consider that those who are foreigners from the body are at home with the Lord of all. But if we are not so strong as always to preserve calm, at least let not the disquiet of the soul be poured forth or appear to strangers, so that we may have the opportunity of giving an apology to God, when we say to him, "My God, my soul is disquieted within me."”

“When the inner person shows signs for a time of wavering between vice and virtue, say, "Why are you cast down, O my soul, and why are you disquieted within me? Hope thou in God, for I shall yet praise him who is the health of my countenance and my God." You must never let suggestions of evil grow on you or a babel of disorder win strength in your breast. Kill the enemy while he is small, and, that you may not have a crop of tares, nip the evil in the bud.”

“"Why art thou cast down, O my soul; and why dost thou disquiet me?" (ver. 11). And, as it seems to answer, "Wouldest thou not have me disquiet thee, placed as I am here in so great evils? Wouldest thou have me not disquiet thee, panting as I am after what is good, thirsting and labouring as I am for it?" What should I say, but, "Hope thou in God; for I will yet confess unto Him" (ver. 11). He states the very words of that confession; he repeats the grounds on which he fortifies his hope. "He is the health of my countenance, and my God."”

“"Why are you sad?" etc. Here he shows the effect of prayer. And prayer has a twofold effect. One is the expulsion of sadness. The other is the increase of hope. The first effect is because through prayer the mind of man ascends to God; and because God is supremely good, when the soul clings to him it feels the greatest delight, and delight drives away or diminishes sadness. And therefore he says, "Why are you sad?" etc., since I have prayed. And this has been explained above. The other effect is that hope grows, because if a king admits someone to familiar service and conversation, he takes on confidence in asking and obtaining. In prayer, moreover, man speaks especially with God. Ps. 28: "In him my heart has hoped," etc. And therefore he adds, "Hope in God"; and this has been explained above.”