common sense
n. sound and prudent judgment based on a simple perception of the situation or facts.
syn. sensibleness, reasonableness, reason, rationality, sanity, saneness, soundness; practicality, practical wisdom, practical mind; sense, good or plain sense, horse sense <nonformal>
ant. foolishness, impracticality, insanity, unreasonableness
Quotes:
Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.
In any war, the first casualty is common sense, and the second is free and open discussion
