Charles H. Spurgeon on Psalms 144:8

Whose mouth speaketh vanity. No wonder that men who are vanity speak vanity. "When he speaketh a lie, he speaketh of his own. "They cannot be depended upon, let them promise as fairly as they may: their solemn declarations are light as the foam of the sea, in no wise to be depended upon. Good men desire to be rid of such characters: of all men deceivers and liars are among the most disgusting to true hearts. And their right hand is a right hand of falsehood. So far their hands and their tongues agree, for they are vanity and falsehood. These men act as falsely as they speak, and prove themselves to be all of a piece. Their falsehood is right handed, they lie with dexterity, they deceive with all their might. It is a dreadful thing when a man's expertness lies more in lies than in truth; when he can neither speak nor act without proving himself to be false. God save us from lying mouths, and hands of falsehood.