Beware of hostile forces suggestions

These feelings of despair and exaggerated sense of self-depreciation and helplessness are suggestions of a hostile Force and should never be admitted. The defects of which you speak are common to all human nature and the external being of every sadhak is full of them; to become aware of them is necessary for the transformation, but it must be done with a quiet mind and with the faith and surrender to the Divine and assured aspiration to the higher consciousness, which are proper to the psychic being. The transformation of the external being is the most difficult part of the yoga and it demands faith, patience, quietude and firm determination. It is in that spirit that you have to throw these depressions aside and go steadily on with the yoga.

Ref : Letters on Yoga Vol. III