Chapter XLIV: Section 45: To speak angrily to a person, to show your hatred by

what you say or by the way you look, is an unnecessary proceeding--dangerous, foolish, ridiculous, and vulgar.

Anger and hatred should never be shown otherwise than in what you do; and feelings will be all the more effective in action, in so far as you avoid the exhibition of them in any other way. It is only cold-blooded animals whose bite is poisonous.