Ain Soph (אין סוף) (also Ayn Sof or Ein Sof), is a Hebrew term that may be translated as "no end," "unending," and frequently referred to as the "infinite". In Kabbalah it is understood as the divine origin of all created existence, in contrast to the Ain (or Ein), which is infinite no-thingness.
- Helena Petrovna Blavatsky, Collected Writings vol. XI (Wheaton, Ill: Theosophical Publishing House, ???), 257. H. P. Blavatsky calls Ain Soph "the Parabrahman of Jewish Kabalists."