The conditions for following the Mother’s Will are to turn to her for Light and Truth and Strength, and aspire that no other force shall influence or lead you, to make no demands or conditions in the vital, to keep a quiet mind ready to receive the Truth, but not insisting on its own ideas and formations,—finally, to keep the psychic awake and in front, so that you may be in a constant contact and know truly what her will is; for the mind and vital can mistake other impulsions and suggestions for the Divine Will, but the psychic once awakened makes no mistake.
A perfect perfection is only possible after supramentalisation; but a relative good working is possible on the lower planes, if one is in contact with the Divine and careful, vigilant and conscious in mind and vital and body. That is a condition, besides, which is preparatory and almost indispensable for the supreme liberation.
Ref : The Mother with Letters on The Mother