What the Bhagavad Gita says about anger
The Gita gives anger a mechanism rather than a scolding. 2.62 and 2.63 lay out the sequence: thinking about an object breeds attachment to it, attachment breeds wanting, wanting that is blocked turns into anger, anger clouds judgement, clouded judgement destroys memory, and with memory gone the person is lost.
What is useful there is the order. Anger is not treated as the first event but as the fourth, which means it can be caught earlier and more cheaply than at the point where you are already shouting. The intervention point is nearer the dwelling than the explosion.
16.21 is the other half. Wanting, anger and greed are named as three gates, and the point of giving a number is that a condition which looked enormous has exactly three entrances. They are also easier to feel than to think about: each has a physical signature you already know, and by the time you can feel the heat in your face you are standing in a doorway rather than past it.
The verses 12
2.56
Not shaken by pain, not hungry for pleasure, past attachment and fear and anger - that is what a settled sage is called.
2.62
Dwell on a thing and you start to hold on to it.
2.63
From anger comes confusion.
3.37
Krishna said: It is wanting.
5.23
Whoever can bear, here and now, before letting go of the body, the force that rises from wanting and anger - he is joined, and he is a happy man.
5.26
For those freed from wanting and anger, restrained in themselves, restrained in mind, who have come to know the self - the peace of the infinite is near on every side.
5.28
… the sage with senses, mind and understanding held steady, aiming at release, with wanting, fear and anger gone: he is free already, always.
16.4
Pretending, arrogance, conceit, anger, harshness, not knowing - these belong to a person born into the demonic share, Arjuna.
16.12
Tied up in a hundred ropes of hope, given over to wanting and anger, they work to pile up money by crooked means, for the sake of getting what they want.
16.18
Leaning on self-importance, on force, on swagger, on wanting and anger, they resent me - in their own bodies and in everyone else's.
16.21
Three gates open on that ruin, and they destroy a person: wanting, anger, greed.
18.53
Freed from self-importance, force, swagger, wanting, anger and holding on to things, without any sense of mine, at peace: such a person is ready to become the absolute.