2 Corinthians 11:4-14

4 For if some one comes and preaches another Jesus than the one we preached, or if you receive a different spirit from the one you received, or if you accept a different gospel from the one you accepted, you submit to it readily enough.
5 I think that I am not in the least inferior to these superlative apostles.
6 Even if I am unskilled in speaking, I am not in knowledge; in every way we have made this plain to you in all things.
7 Did I commit a sin in abasing myself so that you might be exalted, because I preached God's gospel without cost to you?
8 I robbed other churches by accepting support from them in order to serve you.
9 And when I was with you and was in want, I did not burden any one, for my needs were supplied by the brethren who came from Macedo'nia. So I refrained and will refrain from burdening you in any way.
10 As the truth of Christ is in me, this boast of mine shall not be silenced in the regions of Acha'ia.
11 And why? Because I do not love you? God knows I do!
12 And what I do I will continue to do, in order to undermine the claim of those who would like to claim that in their boasted mission they work on the same terms as we do.
13 For such men are false apostles, deceitful workmen, disguising themselves as apostles of Christ.
14 And no wonder, for even Satan disguises himself as an angel of light.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.