Wikipedia as usual is my starting point. I'm going to reformulate Reinhold Niebuhr's prayer so that it works better for me.
I took out "God", because I'm an agnostic Buddhist. Now you can add your higher power in front of that statement if that works for you. For me my higher power is the Dharma, wait, actually the three jewels; The Buddha, Dharma and Sangha. They don't so much grant me those things, but they are my higher power. An important component of the higher power isn't any metaphysic or dogma, it's just plain conditionality, cause and effect in the world.
Living one day at a time,
As awesome as Jesus is, I would take that out for me. I don't accept that I was necessarily born in sin. I like the taking one day at a time, and enjoying one moment at a time. I like the idea of being reasonably happy. That's a good pairing of words you don't always hear. It kind of puts a cap on our rampant materialism. I'm not so sure about the "next world", and think about the denial of death.
So I could write it for me this way:
Enjoying one moment at a time,
(I think Cheryl Strayed captures it well in this quote.)