"Tell me, you who want to live under the law, do you know what the law actually says? The Scriptures say that Abraham had two sons, one from his slave wife and one from his freeborn wife. The son of the slave wife was born in a human attempt to bring about the fulfillment of God’s promise. But the son of the freeborn wife was born as God’s own fulfillment of his promise." (Galatians 4:21-23) The Bible teaches that every believer has two natures: the old, fallen nature of Adam and the new, perfect nature of Jesus Christ. What this means is that, in a sense, Christians are bipolar. We explore that idea in this 20-Minute Bible Study.