Ever since the Fall, purity must be on the lookout for potential impurities. What we believe to be true about God is vulnerable to strong and destructive forces. It's no wonder that Paul warned Timothy to "watch your life and doctrine closely."
Every Wind of Doctrine
October 1, 2008
So just how does the devil contrive to get us off track? John Calvin, in a sermon on the first chapter of Ephesians, says that....
"the devil strives ceaselessly to turn us to evil. And when he cannot lead us completely away from the doctrine of Jesus Christ, he labors to make it distasteful to us some way or another, and to entangle us in new curiosities, only to bring to pass that we may not be constant in the faith that we have received, but give way to vacillation.
Now whenever our fancies are so fidgety, it is certain that an opening is made to blot out the remembrance of all that we have learned before, and to take in many follies, yes, and erroneous doctrines, which serve to corrupt and pervert the purity of our faith. (Ephesians Sermon #1)