Mysticism—From the Greek mystes, one initiated into the mysteries or secrets of higher knowledge. Andrew Weeks, a scholar of this subject, points out the difficulty of coming to clear terms with what mysticism actually is: The concept of mysticism is controversial and ambiguous in its core. There is no agreement among scholars on the question of who ought to be classified as a mystic. (from German Mysticism, 1993, p. 3) St. John of the Cross, a Christian mystic, wrote: In order to arrive at that which thou knowest not, Thou must go by a way that thou knowest not. In order to arrive at that which thou possesseth not, Thou must go by a way that thou possesseth not. As Śrīla Prabhupāda once said, Mystical means misty. See Brahmajyoti, Ecstasy, Sphoṭavāda.