„While this is a legitimate place to begin, it is not the end… Even in simple asanas, one is experiencing the three levels of quest: the external quest, which brings firmness of the body; the internal quest, which brings steadiness of intelligence; and the innermost quest, which brings benevolence of spirit.“

— B.K.S. Iyengar

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„The practice of yogasana for the sake of health, to keep fit, or to maintain flexibility is the external practice of yoga. … While this is a legitimate place to begin, it is not the end ... Even in simple asanas, one is experiencing the three levels of quest: the external quest, which brings firmness of the body; the internal quest, which brings steadiness of intelligence; and the innermost quest, which brings benevolence of spirit.“
— B.K.S. Iyengar
„As a man who has devoted his whole life to the most clearheaded science, to the study of matter, I can tell you as a result of my research about the atoms this much: There is no matter as such! All matter originates and exists only by virtue of a force which brings the particles of an atom to vibration and holds this most minute solar system of the atom together…. We must assume behind this force the existence of a conscious and intelligent Spirit. This Spirit is the matrix of all matter.“
— Max Planck