He who knows he who knows not, and knows not that he knows not, is a fool, shun him; He who knows not, and knows that he knows not, is a child, teach him. He who knows, and knows not that he knows, is asleep, wake him. He who knows, and knows that he knows, is wise, follow him. – Proverb

What a fool does in the end, the wise do in the beginning. – Proverb