What are the qualities of a sincere person?

[Flame of Hope]

Sincerity is everything in Islam because only the deeds that are done out of sincerity to Allah will be accepted. This makes me ask:

1. How does a sincere person conduct himself/herself?

2. How can you tell the difference between a person who is sincere and who isn't?

3. What are the qualities of a sincere person?

Answer any or all the questions. Your choice. Fire away!

[in jihad]

1. How does a sincere person conduct himself/herself?

I think, very carefully.

They're very cautious about everything they say and do.

Very god-fearing, I guess.