Fundamentals of Sadhana

Cast away from you these movements of doubt, depression and the rest which are no part of your true and higher nature. Reject these suggestions of inability, unfitness and all these irrational movements of an alien force. Remain faithful to the Light of your soul even when it is hidden by clouds…. The one need for you and for all is to be, even in the darkness of the powers of obscurity of the physical consciousness, stubbornly faithful to your soul and to the remembrance of the Divine Call. Be faithful and you will conquer.

Ref : Letters on Yoga Vol. IV