Gentleness is moderation with respect to anger. But it must be noted that we have no recognized name for the mean, and scarcely any recognized names for the extremes. And so the term gentleness, which properly denotes an inclination towards deficiency in anger (for which also we have no recognized name), is applied to the mean.
The excess may be called wrathfulness; for the emotion concerned is wrath or anger, though the things that cause it are many and various.
He then who is angry on the right occasions and with the right persons, and also in the right manner, and at the right season, and for the right length of time, is praised; we will call him gentle, therefore, since gentleness is used as a term of praise. For the man who is called gentle wishes not to lose his balance, and not to be carried away by his emotions or passions, but to be angry only in such manner, and on such occasions, and for such period as reason shall prescribe. But he seems to err rather on the side of deficiency; he is loath to take vengeance and very ready to forgive.