'Powerful' in the Bible

For the arms of our warfare are not fleshly, but powerful according to God to the overthrow of strongholds;

Wherefore I take pleasure in weaknesses, in insults, in necessities, in persecutions, in straits, for Christ: for when I am weak, then I am powerful.

Since ye seek a proof of Christ speaking in me, (who is not weak towards you, but is powerful among you,

For we rejoice when we may be weak and ye may be powerful. But this also we pray for, your perfecting.