Thought and thinking are cognitive processes used for judging, reasoning, concept formation, problem solving, deliberation, considering an idea, memory, imagination perception and unconscious mental processes. Consciousness is awareness of internal and external existence, the most mysterious aspect of our lives, synonymous with the mind one's inner life, the world of introspection, imagination and volition. Inner speech is silently evoking words to form mental sentences with muscle activity in the speech organs known as the language of thought referred as Mentalese. Thinking is the succession of ideas governed by laws of association, determining the train of thoughts. Behaviorism, is a reaction to stimuli illustrated in Pavlov's dog experiment. Computationalism considers thinking as a form of information processing similar to computer operations in the 20th century. Thinking is the act of judging deciding what to believe whether the judged proposition is true or false. Reasoning is the most paradigmatic form of thinking drawing conclusions from premises. Fallacies go against the norms of correct reasoning. Concepts are fundamental building blocks of thought..