As men do not gather grapes of thorns, nor figs of thistles, so sound Christian character does not grow out of unsound doctrine.
Absolute Necessity of Sound Doctrine
The author begins by identifying the prevailing problem in the church today, that doctrine seems to be neglected. The "heart vs. head heresy" is cited as the problem. Consequently the author then traces where false doctrine harmed or was a potential harm to the church, and then considers the positive effects of sound doctrine. The author concludes by explaining the link and relationship between theory and practice, or doctrine and life.
Deadly Doctrines: Facing Evil Like Snakes and Doves
How can you protect yourself against false teachers and false doctrine? By heeding the words of Christ and Paul from Matthew 10:16 and Romans 16:19 that protection from false teachers can be achieved.