'In Me' in the Bible

As the truth of Christ is in me, no one will stop me from this boasting in the regions of Achaia.

For if I would desire to boast, I will not be foolish; for I will speak the truth. But I refrain, so that no man may think more of me than that which he sees in me, or hears from me.

seeing that you seek a proof of Christ who speaks in me; who toward you is not weak, but is powerful in you.