Why write?

Why should I write, I sometimes wonder. Even though I do not know the reason, I have the urge to write. Not sure if its cathartic, or serves a larger purpose, or even if my philosophy will ever reach anyone. However, I do know, once my message is reached to even a single person, the differences, the usual grievances, sadness will all be replaced with a different experience, which would neither be good or bad, happiness or sadness.