Answer: reason

AnswerCrossword Clue
REASONThe ability to think.
REASONThink in a logical manner
REASON"Neither rhyme nor ...." Comedy of Errors.
REASONUnderstanding.
REASONMotive.
REASONFeature of Paine's age.
REASONIntellect.
REASONJustification.
REASONCompanion of "rhyme."
REASONGood sense.
REASONExplanation.
REASONBasis
REASONRight thinking.
REASONArgue rationally.
REASONSense.
REASONCause.
REASONGround or cause.
REASONTalk persuasively.
REASONArgue logically.
REASONSanity.
reasonto induce a change of opinion in (someone) through presentation of arguments; convince
REASONGood sense
REASONMr. Spock's logic
REASONWhy or wherefore
REASONIntellectual power
REASONMotive
REASONFigure out
REASONThink logically
REASONFigure (out)
REASONWhy
REASONGood thinking
REASONCause
REASONLogic
REASONLeft brain's forte, supposedly
REASONUse logic
REASONUse one's noodle
REASONJustification
REASONRationale
REASONAnalyze
REASONThink through