sincerity - is the quality of being open and truthful; not deceitful or hypocritical.

In the modern world, sincerity is the rare and often admired virtue of speaking truly about one's feeling, thoughts, desires. Sincere expression carries risks to the speaker, since the ordinary screens used in everyday life are opened to the outside world. At the same time, we expect our friends, our lovers, our leaders to be sincere.

Sincerity quotes

Nothing gives rest but the sincere search for truth.

Sincerity  makes the very least person to be of more value than the most talented hypocrite.

All wrong doing is done in the sincere belief that it is the best thing to do.

Sincerity and truth are the basis of every virtue.

Weak people cannot be sincere.

Be sincere, be brief; be seated.

No lover, if he be of good faith, and sincere, will deny he would prefer to see his mistress dead than unfaithful.

The way I see it, it doesn't matter what you believe just so you're sincere.