Logic

A famous professor of mathematics at Cambridge University decided that he needed to become more cultured in world literature.  Going to an advisor he asked, "Would you tell me a good book in which to begin to learn the rudiments of literature?"  Having recommended Tennyson's "Charge of the Light Brigade," he later returned to the English professor and remarked, "The book sayid, " leagues another league and another league."  Why couldn't he just have said, one and one-half leagues?" -Louis Jacobs
Literature is for the heart, not the head.  It is important to know which to use and when.