Doing things for others is a natural part of being human. Neuroscientists have proven that doing well and good dumps, oxytocin and dopamine, good hormones, into our systems. It is self-fulfilling; the more we do good things, especially for others, the more we are motivated to do it again. Our hormones urge us on. It is how we have evolved as social beings. It is how we will progress.
Live a good life. If there are gods and they are just, then they will not care how devout you have been, but they will welcome you based on the virtues you have lived by. If there are gods, but unjust, then you should not want to worship them. If there are no gods, then you will be gone, but will have lived a noble life that will live on in the memories of your loved ones.
– Marcus Aurelius (161-180 CE).
Consider what it is to live the Good Life — then do it!