Prov 22:15

“"Foolishness is bound up in the heart of a child," etc. We know many children endowed with wisdom; for Jeremiah undertook the ministry of prophecy as a child. And Daniel writes, "Because God gave to the children abstaining knowledge and discipline in every word and wisdom" (Dan. II). Wherefore, it remains to understand that by children in this place he means not by age, but by sense, the little ones; such as the Apostle forbade the Corinthians to be, to whom he said: "Do not be children in understanding; but in malice be children" (I Cor. XIV). For such children, that is, souls dedicated to foolishness, or to licentiousness, or to sloth, it is necessary that they be disciplined by youthful correction and guided by the vigor of the wise to the right path of life.”