This is a good book for anyone considering marriage, getting married or already married.
A few quotes:
Marriage problems are overwhelmingly problems with sin -- lack of conformity to the Word of God in thoughts, words, and actions.
Maturity in the Lord is a prerequisite to maturity in marriage.
...countless marriages have not really been spiritually consummated... a marriage cannot be spiritually consummated if the husband acts the part of a spiritual eunuch...