'In Me' in the Bible

As the truth of Christ is in me, this boasting of mine will not be stopped in the regions of Achaia.

Though if I should boast, I will not be a fool, for I will be speaking the truth. But I refrain from it, so that no one may think more of me than he sees in me or hears from me.

since you desire proof that Christ is speaking in me. He is not weak in dealing with you, but is powerful in you.