Discipline, observances, posture, exercise of the life-force, introversion of attention, concentration, meditation and illumination (at-onement) are the eight limbs of yoga or the direct realization of oneness. Hence, these limbs should all be practiced together, intelligently, so that the impurities of all the physical, vital and psychological limbs maybe eliminated.
Patanjali/ Yoga Sutra, carte care consider ca ar trebui studiata in scoala.
Capitolul II. 29.