Sri Aurobindo was speaking of himself drawing the Supramental Power for earth and mankind when he was asked by the disciples as to what he was doing. As the pioneer and pathfinder he had to engage in an unprecedented tapasya as none before him. It is like a scientist discovering the nuclear or solar energy for earth purposes. But if we try it the effect will be like lifting the mace of Bhima. We will be simply crushed under its power as we are from the sacrifice of desires, equality, fearlessness, egolessness, leave alone the tapasya required. That is why he decided to give this to man through the Mother. By giving ourselves to the Mother and opening to Her, She begins to work and prepare us, doing the Yoga for us until we are ready to receive the Force.
Affectionately,
Alok Da