'Weakness' in the Bible

If I must boast, I will boast about the things that show my weakness.

But he said to me, "My grace is enough for you, for my power is made perfect in weakness." So then, I will boast most gladly about my weaknesses, so that the power of Christ may reside in me.

For indeed he was crucified by reason of weakness, but he lives because of God's power. For we also are weak in him, but we will live together with him, because of God's power toward you.