Vernunft abstract thought act of thought analysis analytic arguments brain brains brainwork cerebral cerebration cogitation conceit conception conceptive conceptual conceptualization creative thought discourse of reason discursive reason endopsychic esprit excogitation explanation explication gray matter head headpiece headwork heavy thinking hypothesis idea ideation imageless thought intellect intellection intellectual intellectual exercise intellectual faculty intellectualization intelligence intelligent internal logic mens mental mental act mental capacity mental labor mental process mentality mentation mind noesis noetic noological nous phrenic postulate power of reason premises psyche psychic psychologic ratio ratiocination ratiocinative ratiocinatory rational rationale rationality rationalization reason reasoning faculty reasons smarts spiritual straight thinking subjective theory thinking thinking aloud thinking out thought understanding