To man, the Essence of God is incomprehensible, so also are the worlds beyond this, and their condition. It is given to man to obtain knowledge, to attain to great spiritual perfection, to discover hidden truths and to manifest even the attributes of God; but still man cannot comprehend the Essence of God. Where the ever-widening circle of man’s knowledge meets the spiritual world a Manifestation of God is sent to mirror forth His splendour.
Abdu’l-Baha’, Abdu’l-Baha’ In London, Man’s Comprehension Of God And Of Higher Worlds