Why not test yourselves instead of me?

^5-8 You should be looking at yourselves to make sure that you are really Christ’s. It is yourselves that you should be testing, not me. You ought to know by this time that Christ is in you, unless you are not real Christians at all. And when you have applied your test, I am confident that you will soon find that I myself am a genuine Christian. I pray God that you may find the right answer to your test, not because I have any need of your approval, but because I earnestly want you to find the right answer, even if that should make me no real Christian. For, after all, we can make no progress against the truth; we can only work for the truth.

^9-10 We are glad to be weak if it means that you are strong. Our ambition for you is true Christian maturity. Hence the tone of this letter, so that when I do come I shall not be obliged to use that power of severity which God has given me—though even that is not meant to break you down but to build you up.