Here are 2 that come to my mind:
Deut. 29:29 The secret things belong to the LORD our God; but the things that are revealed belong to us and to our children for ever, that we may do all the words of this law.
Ecclesiasticus 3:22-25 (Douay) Seek not the things that are too high for thee, and search not into things above thy ability; but the things that God hath commanded thee, think on them always, and in many of His works be not curious. For it is not necessary for thee to see with thy eyes those things that are hid. In unnecessary matters be not over curious, and in many of His works thou shalt not be inquisitive.
(Parallel passage in NAB reads:
Sirach 3:21-22 What is committed to you, attend to; for what is hidden is not your concern. With what is too much for you meddle not, when shown things beyond human understanding.)