'Casting' in the Bible

(for the weapons of our warfare are not of the flesh, but mighty before God to the casting down of strongholds),

Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;

for even if also anything more abundantly I shall boast concerning our authority, that the Lord gave us for building up, and not for casting you down, I shall not be ashamed;

because of this, these things -- being absent -- I write, that being present, I may not treat any sharply, according to the authority that the Lord did give me for building up, and not for casting down.