Charles H. Spurgeon on Psalms 140:3

They have sharpened their tongues like a serpent, etc. Is it not a fact, that there are many men, the very existence of whom is a baneful poison, as it were? They dart their livid tongue like the tongue of a serpent; and the venom of their disposition corrodes every object upon which it concentrates itself; ever vilifying and maligning, like the ill omened bird of night. —Pliny.