REASON

(JUDGMENT) [noun] [U] - the ability of a healthy mind to think and make judgments, esp. based on practical factsWe humans assert that we are the only animals to have the power of reason.(esp. UK dated) He lost his reason (= became mentally ill) when both his parents were killed in the crash.What is within reason is what is practical or acceptable.You can choose you own gift, within reason.If what someone says or does is/goes beyond all reason, it is unacceptable.The awful things she said went beyond all reason.To listen to/see reason is to listen to good advice and act according to it.Friends tried to persuade them to change their minds but neither man would listen to reason.