Alexander, king of Macedon, began to study geometry; unhappy man, because he would thereby learn how puny was that earth of which he had seized but a… - Seneca

Some of the wisest of men have in consequence of this called anger a short madness: for it is equally devoid of self control, regardless of decorum, forgetful of kinship, obstinately engrossed in whatever it begins to do, deaf to reason and advice, excited by trifling causes, awkward at perceiving what is true and just, and very like a falling rock which breaks itself to pieces upon the very thing which it crushes.

To animals not only human virtues but even human vices are forbidden: their whole constitution, mental and bodily, is unlike that of human beings...they possess intellect, the greatest attribute of all, but in a rough and inexact condition. It is, consequently, able to grasp those visions and semblances which rouse it to action, but only in a cloudy and indistinct fashion. Their impulses and outbreaks are violent, and that they do not feel fear, anxieties, grief, or anger, but some semblances of these feelings: wherefore they quickly drop them and adopt the converse of them: they graze after showing the most vehement rage and terror, and after frantic bellowing and plunging they straightaway sink into quiet sleep.

What madness this is, to punish oneself because one is unfortunate, and not to lessen, but to increase one’s ills! You ought to display, in this matter also, that decent behaviour and modesty which has characterised all your life: for there is such a thing as self-restraint in grief also.