Charles H. Spurgeon on Psalms 55:21

The words of his mouth were smoother than butter. He lauded and larded the man he hoped to devour. He buttered him with flattery and then battered him with malice. Beware of a man who has too much honey on his tongue; a trap is to be suspected where the bait is so tempting. Soft, smooth, oily words are most plentiful where truth and sincerity are most scarce. But war was in his heart. He brought forth butter in a lordly dish, but he had a tent pin ready for the temples of his guest. When heart and lip so widely differ, the man is a monster, and those whom he assails are afflicted indeed. His words were softer than oil. Nothing could be more unctuous and fluent, there were no objectionable syllables, no jars or discords, his words were as yielding as the best juice of the olive; yet were they drawn swords, rapiers unsheathed, weapons brandished for the fray. Ah! base wretch, to be cajoling your victim while intending to devour him! entrapping him as if he were but a beast of prey; surely, such art thou thyself.