Journal of Cosmology | Consciousness is not a singularity, but a multiplicity. It is this multiplicity which makes self-consciousness (consciousness of consciousness) possible, and which provides the foundation for the development of thought which originates outside of consciousness. Thinking serves as a form of deduction and self-explanation, where one aspect of the mind explains its thoughts to another realm of mind. Thinking can be visual, imaginal, tactile, musical, or take the form of words strung together as a train-of-thought. Insofar as thoughts are verbal, this indicates that one region of the brain is organizing and explaining these verbal thoughts to another region of the mind which comprehends these verbal thoughts. Verbal thinking utilizes the same neural pathways and structures as spoken language; and Broca's expressive and Wernicke's receptive speech areas participate in the expression and comprehension of verbal thoughts. Because these neural pathways and language structures are immature for the first several years of life, and are limited in their ability to communicate within the brain, children initially think out-loud, using a form of language referred to as egocentric speech. As the brain matures, egocentric speech eventually becomes internalized as thought, such that by ages 5 to 6, children have completely internalized egocentric thought production, and think their thoughts in the privacy of their head. However, because the mind is a multiplicity with different tissues of the mind processing different forms of information, the dominant streams of consciousness associated with vision and language, often do not have access to information which might explain the motives for their actions, or how they arrived at certain conclusions or judgments. Because the mind is a multiplicity, in the final analysis, we knowers, remain unknown to ourselves.