Thomas Aquinas, on Ps 49:15

“And call upon me in the day of trouble: I will deliver thee, and thou shalt glorify me.”

“"And call upon me." Here the Lord sets forth what he will give in return to those who worship him. And first he shows what the saints suffer. Second, what they do in tribulations. Third, what they receive from God. Fourth, what they render to God in return. He says, therefore, that by the fact that someone pays his vows, he is nevertheless afflicted. Ps. 68: "My enemies persecute me unjustly." And the reason for this is that unless the just were afflicted in this world, many would serve God not for his own sake but for the sake of prosperity. Second, he shows what they do in the time of tribulation, because they must call upon him: "And you shall call upon me." What shall God do for him? He shall free him: "I will deliver you." Ps. 119: "When I was in tribulation, I cried to the Lord," etc. And afterwards, once freed, he must honor God: "And you shall honor me."”

Imported from an open dataset — not yet checked against the printed edition.