Answer:
It makes him seem as if he is contradicting himself. I say this because in the Declaration of Independence Thomas Jefferson wrote, "all men are created equal, that are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the Pursuit of Happiness." He wrote this trying to say that everyone is born free, but yet he owned slaves, which slaves were not free. Slaves were considered to be property of another person.