Without conversion of heart we could not enjoy heaven, if we got there. Heaven is a place where holiness reigns supreme, and sin and the world have no place at all. The company will all be holy; the employments will all be holy; it will be an eternal Sabbath-day. Surely if we go to heaven, we must have a heart in tune and able to enjoy it, or else we shall not be happy. We must have a nature in harmony with the element we live in, and the place where we dwell. Can a fish be happy out of water? We know it cannot. Well, without conversion of heart we could not be happy in heaven.