Charles H. Spurgeon on Psalms 140:11

Let not an evil speaker be established, etc. The positions laid down in this verse will find abundant illustration in every age of the church. "An evil speaker", who takes delight in wounding the reputation of others, is seldom established or prospered in the earth. Providence fights against such an unhappy wretch. "The violent man", the ishmaelite whose hand is against every man, is in general overthrown by the very same weapons which he wields against others. —John Morison.