A commentary on the 8th century Kashmir Shaivism text Spanda Karika (Verses on Divine Pulsation). This book is based on lectures given during weekly satsangs, prayer meetings, of the meditation center the authors ran from 1975 until 1982 under the guidance of their Guru, Swami Muktananda. The authors are professors of mathematics in two colleges of the City University of New York.The same inquisitiveness, experimentation, openness, and logical thinking required in studying physical science (obviously in the waking state) is also necessary in studying spanda?the conscious pulsation. The experiences that the study of the conscious pulsation brings are real as per Einstein?s definition of reality since they also contain ?sense perceptions that are common to different individuals? and in a measure, impersonal.? Many researchers, whom we call saints, separated by time and space and not in direct contact with one another, have reported the same sensory experiences. Also they have reported experiencing something common: that which is beyond sense perceptions.The subject matter of the current text Spandakarika is th