The beginnings of this inner life require him to be alone and to keep them secret. It is best to have only a spiritual guide who is understanding and sympathetic around. He needs protection against those whose violence, materialism, or scepticism would thwart, obstruct, or stifle the tender growth. It is because such conditions are hard to secure in the world's ordinary life that convents, ashrams, and monasteries were established.
-- Notebooks Category 3: Relax and Retreat > Chapter 4: Retreat Centres > # 83