When the Creator of the universe looks down at humanity He is able to identify those who are wise and those who are foolish by the choices that we make. Do the choices we make show that we have knowledge and good judgement, or the lack thereof. Understanding God's view and perspective on life and all it amounts to is absolute and altogether complete. On the other hand, as human beings, our understanding is very limited and extremely incomplete. So to hear from God is a privilege of His grace. Therefore, to be wise is to do what you've been privileged to hear, but to hear what to do and not do it, is to be foolish.