The only walls of separation are those built by consciousness of separation. Many factors enter into the process of thinking. The capacity of the thinker to form thoughts, to give them substance and force, is the great factor. The understanding of right and wrong, truth and error, substance and shadow, is important. Many significant conditions enter into that mental process loosely termed thinking.
Every mental process is generative.
From thinking is evolved what is called living. Thinking is formative. Thought clothes itself in a life form according to the character given it by the thinker. Every thought produces a living organism. Thought is creative and covers every phase of life.