It is not physical solitude that actually separates one from others; not physical isolation, but spiritual isolation. It is not the desert island nor the stony wilderness that cuts you from the people you love. It is the wilderness in the mind, the desert wastes in the heart through which one wanders lost and a stranger. When one is a stranger to oneself then one is estranged from others too. If one is out of touch with oneself, then one cannot touch others. How often in a large city, shaking hands with my friends, I have felt the wilderness stretching between us. Both of us were wandering in arid wastes, having lost the springs that nourished us - or having found them dry. Only when one is connected to one's own core is one connected to others, I am beginning to discover. And, for me, the core, the inner spring, can best be refound through solitude.

This excerpt comes from Gift from the Sea, written in 1955. I came across it in the Daily Dig sent out by Bruderhof Communities.