'In Me' in the Bible

For our reason for boasting is this: the testimony of our conscience that we conducted ourselves in the world, and especially toward you, in holiness and purity of motive from God, not in merely human wisdom, but by the grace of God.

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

And he said to me, "My grace is sufficient for you, because the power is perfected in weakness." Therefore rather I will boast most gladly in my weaknesses, in order that the power of Christ may reside in me.

since you are demanding proof that Christ, who [is] not weak toward you, but is powerful among you, is speaking in me.