2 Corinthians 11:3-15

But I fear that, as the serpent deceived Eve by his craftiness, your minds will be corrupted from the simplicity and purity of devotion to Christ. For if one comes and preaches another Jesus whom we did not preach, or you receive a different spirit which you did not receive, or a different gospel which you did not accept, you bear this beautifully. For I consider myself in no way inferior to the most-eminent apostles. But even if I am unskilled in word, yet I am not so in knowledge; in fact, in every way we have made this evident to you in all things. Or did I commit a sin in humbling myself so that you might be exalted, because I proclaimed the gospel of God to you without charge? I robbed other churches by taking wages from them to minister to you. And when I was present with you and was in need, I was not a burden to anyone; for when the brothers came from Macedonia they fully supplied my need, and in everything I kept and will keep myself from being a burden to you. As the truth of Christ is in me, this boasting of mine will not be stopped in the regions of Achaia. Why? Because I do not love you? God knows I do! But what I am doing I will continue to do, so that I may cut off opportunity from those who desire an opportunity to be found just as we are in the matter about which they are boasting. For such men are false apostles, deceitful workers, disguising themselves as apostles of Christ. And no wonder, for even Satan disguises himself as an angel of light. Therefore it is not surprising if his ministers also disguise themselves as ministers of righteousness, whose end will be according to their deeds.