Mysticism is a rational enterprise. Religion is not. The mystic has recognized something about the nature of consciousness prior to thought, and this recognition is susceptible to rational discussion. The mystic has reasons for what he believes, and these reasons are empirical. The roiling mystery of the world can be analyzed with concepts (this is science), or it can be experienced free of concepts (this is myticism). Religion is nothing more than bad concepts held in place of good ones for all time. It is the denial--at once full of hope and full of fear--of the vastitude of human ignorance.
Source: The End of Faith: Religion, Terror, and the Future of Reason, Pages: 221
Contributed by: ~C4Chaos