Fewer issues are as contrary to 21st Century western cultural values as the Christian call for purity in sexual matters. Dr. Zeile explains that the nature of sex as the "glue" that unites husband and wife is a blessing when used according to God's intent, but a curse when misused. Perhaps half of all Americans have been rejected by those who have known them most intimately. To be rejected by one who knows you best is one of the most crushing  experiences possible. Yet, through Christ, healing and redirection of life is possible. This is expressed in David's Psalm 51, and the hymn  "O God be Merciful to Me," which accompany this exposition.