Matthew 13:25

While men slept] This detail may indicate the subtlety of the evil one in introducing evil into the Church in ways that cannot be traced. His enemy] By no more striking expression could the greatness of the power of Satan be indicated than by this, that he is described as the antagonist of Christ Himself. Nothing in the NT. lends colour to the modern tendency to minimise evil, or to regard it as another form of good. Tares] or 'bastard wheat': so much like true wheat, that until the corn is in the ear the two cannot be distinguished. Hence any attempt to root up the tares would result in rooting up the wheat also. So in the Church any attempt to distinguish between true and false Christians is doomed to failure.