Whether flattery is a sin?

Objections

Objection 1 : It seems that flattery is not a sin. For flattery consists in words of praise offered to another in order to please him. But it is not a sin to praise a person, according to Prov. 31:28, "Her children rose up and called her blessed: her husband, and he praised her." Moreover, there is no evil in wishing to please others, according to 1 Cor. 10:33, "I . . . in all things please all men." Therefore flattery is not a sin.
Objection 2 : Further, evil is contrary to good, and blame to praise. But it is not a sin to blame evil. Neither, then, is it a sin to praise good, which seems to belong to flattery. Therefore flattery is not a sin.
Objection 3 : Further, detraction is contrary to flattery. Wherefore Gregory says (Moral. xxii, 5) that detraction is a remedy against flattery. "It must be observed," says he, "that by the wonderful moderation of our Ruler, we are often allowed to be rent by detractions but are uplifted by immoderate praise, so that whom the voice of the flatterer upraises, the tongue of the detractor may humble." But detraction is an evil, as stated above (Question [73], Articles [2],3). Therefore flattery is a good.