We write for the same reason that we walk, talk, climb mountains or swim the oceans — because we can. We have some impulse within us that makes us want to explain ourselves to other human beings. That’s why we paint, that’s why we dare to love someone- because we have the impulse to explain who we are. Not just how tall we are, or thin… but who we are internally… perhaps even spiritually. There’s something, which impels us to show our inner-souls. The more courageous we are, the more we succeed in explaining what we know.

-- Maya Angelou on why we write. Also see Joan Didion and George Orwell on the same.