15 Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him.
We have here two very sad considerations:–
1. That corruption is woven into our nature. Sin is foolishness; it is contrary both to our right reason and to our true interest. It is in the heart; there is an inward inclination to sin, to speak and act foolishly. It is in the heart of children; they bring it into the world with them; it is what they were shapen and conceived in. It is not only found there, but it is bound there; it is annexed to the heart (so some); vicious dispositions cleave closely to the soul, are bound to it as the cion to the stock into which it is grafted, which quite alters the property. There is a knot tied between the soul and sin, a true lover’s knot; they two became one flesh. It is true of ourselves, it is true of our children, whom we have begotten in our own likeness. O God! thou knowest this foolishness.
2. That correction is necessary to the cure of it. It will not be got out by fair means and gentle methods; there must be strictness and severity, and that which will cause grief. Children need to be corrected, and kept under discipline, by their parents; and we all need to be corrected by our heavenly Father (Heb. 12:6, 7), and under the correction we must stroke down folly and kiss the rod.
– Matthew Henry Commentary