Proverbs 9:8-9

Do not correct a scoffer (who foolishly ridicules and takes no responsibility for his error) or he will hate you; correct a wise man and he will become even wiser; teach a righteous man and he will increase his learning. 

A teachable heart is essential. Our lives and growth in God depend on whether or not we are willing to learn. The lesson may come to us in a correction from God or someone speaking into our lives. We can increase and avoid sin when we have a willing, teachable heart.