The Bible is clear: a true Christian, i.e., a disciple of Christ, should be a lifelong learner. This is, in part, because there is so much to learn that we can't hope to acquire all knowledge, but also because very often we learn things that are incomplete, or just plain wrong. When this happens it is important to unlearn, as we see through Peter's example in this expository sermon from Acts 10:1-11:18; sermon begins at about 17:30.