Aristotle, Nicomachean Ethics
H. Rackham, Ed.

There is also a character¹ that takes less than the proper amount of pleasure in the things of the body, and that fails to stand by principle in that sense. The self-restrained man therefore is really intermediate between the unrestrained man and the type described. The unrestrained man departs from principle because he enjoys bodily pleasures too much, the person described does so because he enjoys them too little; while the self-restrained man stands by principle and does not change from either cause. And inasmuch as Self-restraint is good, it follows that both the dispositions opposed to it are bad, as indeed they appear to be; but because one of the two is found only in a few people, and is rarely displayed, Unrestraint is thought to be the sole opposite of Self-restraint, just as Profligacy is thought to be the sole opposite of Temperance.