WIST

Anyone can become angry — that is easy, but to be angry with the right person, to the right degree, at the right time, for the right purpose, and in the right way — that is not easy.

[οὕτω δὲ καὶ τὸ μὲν ὀργισθῆναι παντὸς καὶ ῥᾴδιον, καὶ τὸ δοῦναι ἀργύριον καὶ δαπανῆσαι· τὸ δ᾽ ᾧ καὶ ὅσον καὶ ὅτε καὶ οὗ ἕνεκα καὶ ὥς, οὐκέτι παντὸς οὐδὲ ῥᾴδιον]

Aristotle (384-322 BC) Greek philosopher
Nichomachean Ethics, Book 2 [II.1109a27] (c. 350 BC)

Alt trans.:

• "Any one can get angry — that is easy — or give or spend money; but to do this to the right person, to the right extent, at the right time, with the right motive, and in the right way, that is not for every one, nor is it easy."
• "The man who gets angry at the right things and with the right people, and in the right way and at the right time, and for the right length of time, is commended."
• "It is easy to fly into a passion -- anybody can do that -- but to be angry with the right person and to the right extent and at the right time and with the right object and in the right way -- that is not easy, and it is not everyone who can do it." [tr.  Thompson (1953); cited as "2.9"]