Definitions: (1) the action of thinking about something in a logical, sensible way; (2) The ability to find an answer to a problem by considering various possible solutions; quick-reasoning <able to produce almost instantaneous answers (as in genius autism); (3) make rational argument <the ability to explain to another how you arrived at your conclusions so that they understand it>
Quotes:
• All variety of created objects which represent order and life in the universe could happen only by the willful reasoning of its original Creator. — Sir Isaac Newton (1642–1727) English polymath [eight disciplines]
• There are also two kinds of truths: truth of reasoning and truths of fact. Truths of reasoning are necessary and their opposite is impossible; those of fact are contingent and their opposite is possible. — Gottfried Wilhelm Leibniz (1646–1716) German polymath [eight disciplines]
Comment: Even if you cannot explain your reasoning to others, make sure you have internal cohesiveness, both logically and emotionally.