Sirach 3:21
Ben Sira, Ecclesiasticus20 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.
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.
Notes and References
"... The Book of Ecclesiasticus [Sirach] has been honored still more highly among the Christians, being cited in the Epistle of James (Edersheim, in Wace, 'Apocrypha,' p. 21), the Didache (4:5), and the Epistle of Barnabas (19:9), while Clement of Alexandria and Origen quote from it repeatedly, as from a γραφή, or holy book. In the Western Church, Cyprian frequently appeals to it in his 'Testimonia,' as does Ambrose in the greater number of his writings. In like manner the Catalogue of Cheltenham, Damasus I., the Councils of Hippo (393) and Carthage (397), Pope Innocent I., the second Council of Carthage (419), and Augustine all regard it as a canonical book. This is contrary, however, to the opinions of the Council of Laodicea, of Jerome, and of Rufinus of Aquileia, which authorities rank it among the ecclesiastical books. It was finally declared canonical by the Council of Trent; and the favor with which the Church has always regarded it has preserved it in its entirety. ..."
Toy, Crawford Howell The Wisdom of Jesus the Son of Sirach (pp. 1-10) Jewish Encyclopedia, 2021