I begin by telling these students, of the vast difference it seems to me there is between knowing and believing. Knowledge is an intellectual affair that we can somehow demonstrate, make public, and pass on to others through the use of words, experiments, and figures. Beliefs, however, are feelings, which we become aware of if we take the time to train ourselves to pay attention to them. We must be careful to distinguish our beliefs from crude emotions, or from the pleasures or irritations of the moment. Beliefs are intensely personal, not public like a fact or a figure. And beliefs are hard to put in words, unless one is a gifted poet or prophet, skilled in using parables.