'Weakness' in the Bible

If I must needs glory, I will glory of the things that concern my weakness.

And he hath said unto me, My grace is sufficient for thee: for my power is made perfect in weakness. Most gladly therefore will I rather glory in my weaknesses, that the power of Christ may rest upon me.

for he was crucified through weakness, yet he liveth through the power of God. For we also are weak in him, but we shall live with him through the power of God toward you.