Definition: showing common sense or sound judgment; reasonable; possessing an even temper

• When things are steep, remember to stay level-headed. — Horace [born Quintus Horatius Flaccus] (65-8 BC) Roman lyric poet
• Never be in a hurry; do everything quietly and in a calm spirit. Do not lose your inner peace for anything whatsoever, even if your whole world seems upset. —Saint Francis de Sales (1567-1622) preacher and writer