Solitude is necessary for your emotional health, whether you are living alone or with another. Solitude gives you the time and space to integrate your experience. And all growth depends on integration. Without solitude, spiritual nourishment will be lacking. If you want a single cause for the amount of distress in the world, it is the fact that people do not take time to commune with self, nature and the divine. A spiritual life — a life free of needless tension and self-created suffering — requires such communion.
Speaking of spirituality, a Sufi master once said, "A river passes through many countries, and each claims it for its own. But there is only one river."
~from BEYOND RELIGION: 8 ALTERNATIVE PATHS TO THE SACRED by David N. Elkins