Answer by Master Vi-Kien:

In the Vô Vi method, we have the exercises of Concentration of Spiritual Energy, Cyclical Breathing, and Meditative Contemplation. We must analyze and purify our energy clearly. We release the impure and retain the pure energy. Only when our energy is focused and unified, will we attain the state of meditative contemplation. The state of contemplation means that we have harmonized with the energy of Great Compassion in order to advance directly toward Nirvana and the celestial sphere.