In this collection of 156 extracts from letters to disciples, Sri Aurobindo explains the central principles and practices of his integral Yoga and sheds light on problems that confront the spiritual seeker. The extracts are organised under headings such as calm, peace, and equality; faith, aspiration, and surrender; desire, food, and sex; and the physical consciousness, the subconscient, sleep and dreams, and illness.

Extract
One who has not the courage to face patiently and firmly life and its difficulties will never be able to go through the still greater inner difficulties of the sadhana. The very first lesson in this Yoga is to face life and its trial with a quiet mind, a firm courage and an entire reliance on the Divine Shakti.
– Sri Aurobindo