'Strong' in the Bible

(For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;)

Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.

For we are glad, when we are weak, and ye are strong: and this also we wish, even your perfection.