The Bible is the definitive (complete, ultimate) handbook on living a successful life here on earth.  It covers every aspect of our life. There isn't a financial advisor on this earth that can compare with the Bible insights into dealing with money.  There isn't a dating coach alive that can give us the informed instructions on dating as the Bible can.  When it comes to marriage, there isn't a marriage counselor available that has the understanding of the husband - wife relationship that the Bible has.