I am not sincere, even when I say I am not.
I dare say anything can be made holy by being sincerely worshiped.
It is dangerous to be sincere unless you are also stupid.
The secret of success is sincerity. Once you can fake that you've got it made.
Sincerity is the way of Heaven.
A little sincerity is a dangerous thing, and a great deal of it is absolutely fatal.
Sincerity is the surest road to confidence.