Read the excerpt from Harriet Tubman: Conductor on the Underground Railroad. She said that he had thick white hair, soft, almost like a baby's, and the kindest eyes she had ever seen. He was a big man and strong, but he had never used his strength to harm anyone, always to help people. He would give all of them a new pair of shoes. Everybody. He always did.

In this excerpt, which rhetorical appeal does Tubman primarily use to convince people to continue?