It is fascinating to see how Jacob and Esau, twins, could have had such different personalities. Rambam says that while some character traits are acquired, others are actually genetic. A person who is talkative by nature is not expected to become a meek and quiet personality, since that runs against his nature. What is expected, however, is that the person be careful to channel his speech into positive speech rather than gossip and other prohibited words.

Esau may have been a hunter and a wild person by nature, but he didn't have to become evil. He could have channeled his nature to accomplish great things, but he chose to become a murderer, and for that he was held accountable. We have to use our nature to become the best we can become.

Have a great Shabbos!