When I spoke of being faithful to the light of the soul and the divine Call, I was not referring to anything in the past or to any lapse on your part. I was simply suggesting the great need in all crises and attacks,—to refuse to listen to any suggestions, impulses, lures and to oppose to them all the call of the Truth, the imperative beckoning of the Light. In all doubt and depression, to say “I belong to the Divine, I cannot fail”; to all suggestions of impurity and unfitness, to reply “I am a child of Immortality chosen by Sri Aurobindo and the Mother; I have but to be true to myself and to them—the victory is sure; even if I fell, I would be sure to rise again”; to all impulsions to depart and serve some other ideal, to reply “This is the greatest, this is the Truth, this alone can satisfy the soul within me; I will endure through all tests and tribulations to the very end of the divine journey.” This is what I mean by faithfulness to the Light and the Call.
Ref : The Mother with Letters on The Mother