Through books, we can thoughtfully explore important issues. People can read and reflect in whatever way is most comfortable to them. This allows for more active engagement with ideas than other media. This communication can be vivid in a way that is difficult to encounter elsewhere. I find that exciting.
For me, writing functions as a way of reflecting on experience, allowing me to connect with experiences more meaningfully. Even if I did not write for publication, I would still write. However, publishing my work has the added benefit of making it possible to enter into a dialogue with readers.
I find it easiest to write early in the morning, when the day is fresh and my mind is most alert. On mornings when nothing seems to flow, I usually try to get out in the open air. Going for a walk seems to not just get my blood flowing; it usually gets my thoughts flowing as well.