To write is to admit that you don't always know the answers to everything, that you sometimes don't have anything new to say, and that you sometimes need to share an idea that you can't just say aloud. To write is to become a better model, a more effective reader, and a person who teaches by example rather than by decree. Those are the reasons to write. Writing is one of the most powerful and accessible communication devices we have. Writing allows you to meditate and polish ideas before releasing them.
Writing allows ideas to be clarified and buffered between the giver and the receiver.
Writing allows time for words to be re-ordered, reconsidered, replaced, improved, and made more powerful. Writing is power. It can generate new energy and it can be a catalyst for personal change and enlightenment. Writing is reaching out, taking risks, exploring the world, and shaping the future. It doesn't really matter whether you write on a yellow pad, a computer screen, or a collection of napkins and envelopes.