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For such men are false apostles, deceitful workmen, disguising themselves as apostles of Christ. And no wonder, for even Satan disguises himself as an angel of light. So it is not strange if his servants also disguise themselves as servants of righteousness. Their end will correspond to their deeds. (2 Corinthians 11:13-15 RSV)

The following is commentary by Ray Stedman

With these words he strips off the facade that these false teachers were trying to hide behind. He says, "They're impostors, they're phonies, they're impersonators, masquerading as apostles of Christ but they were not sent by Christ and they're not teaching what Christ said to teach. They're teaching attractive lies instead of the truth." This tactic is one of the great missing elements in the church today. One reason why many churches are destroyed is because nobody will stand up and say this about false teachers. We are so caught up with the world's philosophy that anything goes, that we have to be nice to everyone always. Notice the apostles never did that, nor did Jesus. Look at the sharp language he employed on occasion with the Pharisees. Right to their faces he called them, "snakes and vipers." He said they were like "dead men's tombs full of rotting bones" (Matthew 23:27), filled with an awful stench. That is not the way to win friends and influence people! Jesus set all that aside and told them the truth.