With the Christian answer it is now possible to understand that there are true moral absolutes. There is no Law behind God, because the furthest thing back is God. The moral absolutes rest upon God’s character. The creation as He originally made it conformed to His character. The moral commands He has given to men are an expression of His character. Men as created in His image are to live by choice on the basis of what God is. The standards of morality are determined by what conforms to His character, while those things which do not conform are immoral.
— Francis Schaeffer, from The God Who is There, p. 105