The effort demanded of the Sadhak is that of aspiration, rejection and surrender. If these three are done the rest is to come of itself by the Grace of the Mother and the working of her force in you. But of the three the most important is surrender of which the first necessary form is trust and confidence and patience in difficulty. There is no rule that trust and confidence can only remain if aspiration is there. On the contrary, when even aspiration is not there because of the pressure of inertia, trust and confidence and patience can remain. If trust and patience fail when aspiration is quiescent, that would mean that the Sadhak is relying solely on his own effort―it would mean, “Oh, my aspiration has failed, so there is no hope for me. My aspiration fails, so what can Mother do?” On the contrary, the Sadhak should feel, “Never mind, my aspiration will come back again. Meanwhile I know that the Mother is with me even when I do not feel her; she will carry me even through the darkest period.” That is the fully right attitude you must have. To those who have it depression can do nothing; even if it comes it has to return baffled. That is not tamasic surrender. Tamasic surrender is when one says, “I won’t do anything; let Mother do everything. Aspiration, rejection, surrender even are not necessary. Let her do all that in me.” There is a great difference between the two attitudes. One is that of the shirker who won’t do anything, the other is that of the Sadhak who does his best, but when he is reduced to quiescence for a time and things are adverse, keeps always his trust in the Mother’s force and presence behind all and by that trust baffles the opposition force and calls back the activity of the Sadhana.
Ref : The Mother with Letters on The Mother