Truth is our element of life, yet if a man fasten his attention on a single aspect of truth, and apply himself to that alone for a long time, the truth becomes distorted and not itself, but falsehood; herein resembling the air, which is our natural element, and the breadth of our nostrils, but if a stream of the same be directed on the body for a time, it causes cold, fever, and even death.  How wearisome the grammartarian, the phrenologist, the political or religious fanatic, or indeed any possessed mortal whose balance is lost by the exaggeration of a single topic.  It is incipient insanity.  Every thought is a prison also.  I cannot see what you see, because I am caught up by a strong wind, and blown so far in one direction that I am out of the hoop of your horizon. – Ralph Waldo Emerson in the essay “Intellect”