The Importance of Spiritual Life with the Spiritual Man. I have worked on this book for two years. This research and study is a work for the last days relative to learning and knowing how to function out of your born-again spirit. In the context of this textbook you will learn why Jesus said "You must be born again." That statement wasn't just so you could go to heaven, it was for something more. Scriptures reveal, "The strong spirit of a man sustains him in bodily pain or trouble, but a weak and broken spirit who can raise up or bear?" (Proverbs 18:14 AMP) We see from this scripture that a weak spirit cannot sustain or bear adversity. Therefore, we must develop a strong spirit, especially today. Developing a strong born-again spirit makes all the difference in our lives; how we live, how we see things, how we receive from God, and how we resist the devil. It absolutely affects everything.