All who enter the spiritual path have to face the difficulties and ordeals of the path, those which rise from their own nature and those which come in from outside. The difficulties in the nature always rise again and again till you overcome them; they must be faced with both strength and patience. But the vital part is prone to depression when ordeals and difficulties rise. This is not peculiar to you, but comes to all sadhakas – it does not imply an unfitness for the sadhana or justify a sense of helplessness. But you must train yourself to overcome this reaction of depression calling in the Mother’s Force to aid you,
All who cleave to the path steadfastly can be sure of their spiritual destiny. If any one fails to reach it, it can only be for one of the two reasons, either because they leave the path or because for some lure of ambition, vanity, desire, etc. they go astray from the sincere dependence on the Divine.
Ref: Letters on Yoga Vol. I