Just do good for the sake of being good....

I don't do good deeds because I'm promised eternal life in heaven. I do them because I believe in humanity and that what goes around comes around. We only get one life to live, and you choose to fill it with either positivity or negativity. If you care about yourself and others, the reason why you choose positivity becomes obvious.
I think the most logical thing is to help... If you dont find it in yourself to help others then you are not really thinking