The reasons according to which he dispenses all things individually are stored up only in the knowledge of God. In fact, we learned in another psalm, which said, “Thy judgments are a great deep,” that the judgments made about each one are called a deep. Therefore, if you seek to know why the life of a sinner is continued but the days of sojourning of the just are cut short; why the unjust thrive but a just person is afflicted; why the young child is snatched away before coming to maturity; whence are wars; why there are shipwrecks, earthquakes, droughts, heavy rains; why things destructive of people are created; why one person is a slave, another free, one is rich, another is poor (and the difference in sins and in virtuous actions is great; she who was sold to a brothel keeper is in sin by force, but she who immediately obtained a good master grows up with virginity); why this one is treated with kindness and that one condemned; and what is the reward in the case of each of these from the Judge; taking all these questions into your mind, consider that the judgments of God are the depths and, because they are enclosed in the divine storehouses, are not easily grasped by those encountering them. To one who believes, a promise is given by God: “I will give you hidden treasures, unseen ones.” When we have been deemed worthy of knowledge face to face, we shall see also the depths in the storehouses of God.
"He gathers the waters of the sea together as into a bottle:" He gathered the people of the world together, to confession of mortified sin, lest through pride they flow too freely. "He lays up the deep in storehouses" [Psalm 33:7]: and keeps in them His secrets for riches.
[AD 379] Basil of Caesarea on Psalms 33:7