The advantage of being in the psychic consciousness is that you have the right awareness and its will being in harmony with the Mother‘s will, you can call in the Mother’s Force to make the change. Those who live in the mind and the vital are not so well able to do this; they are obliged to use mostly their personal effort and as the awareness and will and force of the mind and vital are divided and imperfect, the work done is imperfect and not definitive. It is only in the supermind that Awareness, Will, Force are always one movement and automatically effective.
Ref: Letters on Yoga – I