Paul says, There is no fear of God in their eyes. Proverbs says that he is a fool and he chooses that pathway. His complacency in spiritual things is something that is going to utterly destroy him. Then Solomon takes the noun and he says this foolishness is what is bound up in the heart of the child. Foolishness is bound up in the heart of that child.
Foolishness is the name of the problem.
Elsewhere the Scripture calls it all kinds of things. The imagination of the heart of man is evil from his youth. So between my child and God there is a tremendous gap. He or she is estranged from God. No matter how gorgeous the child is there is a tremendous gulf between God and that child, and that gulf is sin.