If you realize that we are not these bodies we wear, then your answer should be easy to see. Each of us spiritual beings is learning, constantly. Sometimes we learn in a prior life; sometimes we learn in this one.
Christ talked of this. He mentioned that they did not recognize Elijah when he came, but did to him all that they pleased; and Christ's disciples knew he talked of John the Baptist. But John did not remember that he was Elijah, so he became a stumbling block to Christ's mission.