[1] while he was working for thomas farmer, he began to buy fruits and other goods and sell them himself. [2] he faced insults and difficulties doing this; however, he was determined to continue making money, which he did. [3] he wanted to obtain enough savings to buy his freedom, which robert king had promised him he could do for the same amount that king had paid for him. [4] when he had saved enough money, he bought his freedom from king and lived the rest of his life as a free man.