I admit, at the very threshold, that every human being thinks as he must; and the first proposition really is, whether man has the right to think. It will bear but little discussion, for the reason that no man can control his thought. If you think you can, what are you going to think to-morrow? What are you going to think next year? If you can absolutely control your thought, can you stop thinking?
The question is, Has the will any power over the thought? What is thought? It is the result of nature--of the outer world--first upon the senses--those impressions left upon the brain as pictures of things in the outward world, and these pictures are transformed into, or produce, thought; and as long as the doors of the senses are open, thoughts will be produced. Whoever looks at anything in nature, thinks. Whoever hears any sound--or any symphony--no matter what--thinks. Whoever looks upon the sea, or on a star, or on a flower, or on the face of a fellow-man, thinks, and the result of that look is an absolute necessity. The thought produced will depend upon your brain, upon your experience, upon the history of your life.
One who looks upon the sea, knowing that the one he loved the best had been devoured by its hungry waves, will have certain thoughts; and he who sees it for the first time, will have different thoughts. In other words, no two brains are alike; no two lives have been or are or ever will be the same. Consequently, nature cannot produce the same effect upon any two brains, or upon any two hearts.
The only reason why we wish to exchange thoughts is that we are different. If we were all the same, we would die dumb. No thought would be expressed after we found that our thoughts were precisely alike. We differ--our thoughts are different. Therefore the commerce that we call conversation.
Back of language is thought. Back of language is the desire to express our thought to another. This desire not only gave us language--this desire has given us the libraries of the world. And not only the libraries; this desire to express thought, to show to others the splendid children of the brain, has written every book, formed every language, painted every picture, and chiseled every statue--this desire to express our thought to others, to reap the harvest of the brain.