In this sermon Reaching for Two Worlds but Not Getting Either, When we talk about the heart, we usually just think of our feelings. But when the Old Testament talks about the heart it includes not just our feelings, but our mind, our will, our entire spiritual nature. It embodies the whole life of a person. Jesus said this was the greatest commandment: You shall love the Lord your God with all your heart, soul, mind, and strength. Matthew 22:37, Deuteronomy 6:5.