No weapon that is formed against thee shall prosper; and every tongue that shall rise against thee in judgment thou shalt condemn. (Isaiah 54:17)
 
There is great clatter in the forges and smithies of the enemy. They are making weapons wherewith to smite the saints.

 They could not even do as much as this if the Lord of saints did not allow them; for He has created the smith that bloweth the coals in the fire. But see how busily they labor!

How many swords and spears they fashion! It matters nothing, for on the blade of every weapon you may read this inscription: It shall not Prosper.
 
But now listen to another noise: it is the strife of tongues. Tongues are more terrible instruments than can be made with hammers and anvils, and the evil which they inflict cuts deeper and spreads wider.

What will become of us now? Slander, falsehood, insinuation, ridicule — these are poisoned arrows; how can we meet them?

The Lord God promises us that, if we cannot silence them, we shall, at least, escape from being ruined by them. They condemn us for the moment, but we shall condemn them at last and forever.

The mouth of them that speak lies shall be stopped, and their falsehoods shall be turned to the honor of those good men who suffered by them.

Charles Spurgeon