It is the last thing in traditional Yoga based on the idea that once the soul realises its true nature it would want to withdraw from the world and not come back. But there are souls that the Mother calls as the heroic souls who, having realised its truth and the true Self, have the aspiration and the urge to heal the earth and to perfect earthly life. For these souls Self Realisation is the beginning of a new journey, the Yoga of transformation along the path shown by Sri Aurobindo and The Mother.
Affectionately,
Alok Da