It is dangerous to be sincere unless you are also stupid. George Bernard Shaw
I don’t think you want too much sincerity in society. It would be like an iron girder in a house of cards. W. Somerset Maugham
The secret of acting is sincerity. If you can fake that, you’ve got it made. George Burns
Sincerity is impossible, unless it pervade the whole being, and the pretence of it saps the very foundation of character. James Russell Lowell
A little sincerity is a dangerous thing, and a great deal of it is absolutely fatal. Oscar Wilde
Sincerity makes the very least person to be of more value than the most talented hypocrite. Charles H Spurgeon
Sincerity is an openness of heart; we find it in very few people; what we usually see is only an artful dissimulation to win the confidence of others. Francois duc de La Rochefoucauld
Men are always sincere. They change sincerities, that’s all. George Ade
The greatest horrors of our world, from the executions in Iran to the brutalities of the IRA, are committed by people who are totally sincere. John Mortimer
You can take all the sincerity in Hollywood, place it in the navel of a firefly and still have room enough for three caraway seeds and a producer’s heart. Fred Allen