Temper

Temper is a word used to denote a variety of qualities. It derives from Temperare (to mix correctly) the Latin origin of words like "temperature" and "tempering"; it and "tempo" come, in turn, from tempus (time or season). Thus, the word "temper" can refer (at least informally) to any time- and temperature-sensitive process, a material's thermo-mechanical history, or even its composition.

Quotes

• Men are like steel — when they lose their temper, they lose their worth.
  • Anonymous proverb; though often attributed to Chuck Norris, this seems to have appeared at least as early as 1961, in an edition of The Physical Educator