Rabbi Ila'i said: A person is known by three things: his cup (by how he holds his wine), his pocket (by his generosity) and his anger.
-- Babylonian Talmud, Eruvin 65b


Maimonides, The Laws of Behavior 2:2:

...So too with anger which is an extremely destructive trait, and it is fitting that one should distance one's self from it to the most extreme, and train himself not to get angry, even at something at which it is appropriate to be angry. If he wishes to make a point with his family or his community, if he was a trustee, and he wishes to improve their ways, he should feign anger in front of them in order to impress them, but he should be in control of himself when he is feigning anger, for he should not truly be angry.

The sages stated: Anyone who becomes angry is like one who practices idolatry.

And they stated: Anyone who is angry--if he is wise, his wisdom flees from him. If he is a Prophet--his Prophecy flees from him. Those who live with rage, their lives aren't worth living, therefore, they commanded [us] to distance ourselves from anger to the point where we will not be sensitive to that which is worth being angry about. This is the best way, and the way of the righteous. They will take insults, but they will not insult others. They will heed their shame, and they will not respond. They only act out of love, and they are happy even in their affliction. It is written of them: "And those who love Him are like the sun that comes out when it is most mighty." (Judges 5:31)

To celebrate the changing from 12/31 to 1/1, please enjoy the winning sonnet from Dr. Chris Small's Epsilon-Delta Poetry Competition.

I have beholden many sets of pairs
But never seen a function rich as thee;
Unlike them who take values without cares
Thou art one blessed with continuity:

Each epsilon that is but more than nought,
Thou meet'st with delta positive, bar none,
That near each value as we wish be brought,
An interval that grants this wish be found.

Thus on all intervals where thou art seen,
Thou honor'st bounds and thou dost both attain,
And thou assum'st all values in between
All pairings of thy values one may name.

To think that such fair traits would all be gone
Couldst thou not match one tiny epsilon!
--Matei Zaharia