True doctrine transforms behavior as it is woven into the fabric of everyday life. But it must be understood if it is to have its impact. The real challenge of the ministry is to dispense the truth clearly and accurately. Practical application comes easily by comparison.
No believer can apply truth he doesn’t know. Those who don’t know the Bible’s principles for marriage, divorce, family, childrearing, discipline, money, debt, work, service to Christ, responsibilities to the poor, care of widows, response to governments, eternal rewards, and other teachings will not be able to apply them.
Those who don’t’ know what the Bible teaches about salvation cannot be saved. Those who don’t know what the Bible teaches about holiness are incapable of dealing with sin. Thus they are unable to live fully to God’s glory and their own blessedness.