" A keen observation shows that the whole universe is a single mechanism working by the law of rhythm; the rise and fall of the waves, the ebb and flow of the tide, the waxing and waning of the moon, the sunrise and the sunset, the change of the seasons, the moving of the earth and of the planets, the whole cosmic system and the constitution of the entire universe are working under the law of rhythm. Cycles of rhythm, with major and minor cycles "

― Hazrat Inayat Khan , The Mysticism of Sound and Music