Sirach 3:21

Ben Sira, Ecclesiasticus

20 For great is the might of the Lord; but by the humble he is glorified. 21 Neither seek what is too difficult for you, nor investigate what is beyond your power. 22 Reflect upon what you have been commanded, for what is hidden is not your concern. 23 Do not meddle in matters that are beyond you, for more than you can understand has been shown you. 24 For their conceit has led many astray, and wrong opinion has impaired their judgment.

Date: 195-175 B.C.E.
* Dates are based on scholarly estimates

Ambrose On the Christian Faith 5.19

Moses excuses himself from the Priesthood, Peter is for avoiding the obedience demanded in the Ministry; and does Arius examine even the deep things of God? But Arius is not the Holy Spirit. Nay, it was said even to Arius and to all men: Seek not that which is too deep for you.

Date: 390-395 C.E.
* Dates are based on scholarly estimates