What should be Killed?

A female deity once asked the Buddha:

Having killed what do you sleep in ease?
Having killed what do you not grieve?
Of the slaying of what one thing does Gotama[Buddha]approve?

[The Buddha:]
Having killed anger you sleep in ease.
Having killed anger you do not grieve.
The noble ones praise the slaying of anger
— with its honeyed crest & poison root —
For having killed it you do not grieve.


- Samyutta Nikaya 1.71, Ghatva Sutta