Charles H. Spurgeon on Psalms 12:2

"They speak vanity every one with his neighbour." They utter that which is vain to hear, because of its frivolous, foolish, want of worth; vain to believe, because it was false and lying; vain to trust to, since it was deceitful and flattering; vain to regard, for it lifted up the hearer, filling him with proud conceit of himself. It is a sad thing when it is the fashion to talk vanity. "Ca'me, and I'll ca'thee." is the old Scotch proverb; give me a high sounding character, and I will give you one. Compliments and fawning congratulations are hateful to honest men; they know that if they take they must give them, and they scorn to do either. These accommodation-bills are most admired by those who are bankrupt in character. Bad are the times when every man thus cajoles and cozens his neighbour. "With flattering lips and with a double heart do they speak." He who puffs up another's heart, has nothing better than wind in his own. If a man extols me to my face, he only shows me one side of his heart, and the other is black with contempt for me, or foul with intent to cheat me. Flattery is the sign of the tavern where duplicity is the host. The Chinese consider a man of two hearts to be a very base man, and we shall be safe in reckoning all flatteries to be such.