We understand things on the basis of logic, we do not know whether our logic is correct. But we assume it to be so and we are comfortable with it; it could be wrong. Our assumption involves leap of faith. So spirituality says that we are making a different assumptions. What are those assumptions that give us a general understanding of the spiritual realm? Watch the 2nd part of the lecture "Science and spirituality" at Stanford University by Swami Mukundananda.