Thanissaro Bhikkhu on Equanimity

"The fourth brahma-vihāra is equanimity. Equanimity is expressed in a different manner from the other three. The first three are expressed with the phrase, “May all beings be happy” and “May they do this” and “May they do that.” In other words, it’s a wish. Equanimity is expressed by a statement of fact. “All living beings are the owners of their actions, heir to their actions, and so forth.” This is not a wish; it’s a statement of fact. There’s no “may” there at all. Equanimity is the appropriate emotion to feel when you see that there are beings who are doing things that will cause suffering and that no matter what you do, they will not stop. Or they are suffering from something in their past actions, and no matter how hard you try to help them you cannot stop that suffering. This is when the Buddha has you reflect on the fact of kamma: All beings are owners of their actions, and there are some cases where their actions prevent you from helping them or your own lack of skill p...

"Look at the words of the reflection: “All beings are owners of their actions. Whatever they do, for good or for evil, to that will they fall heir.” It’s a recognition of responsibility, and it’s a recognition of cause and effect. This is one of the reasons why equanimity is said to be the highest of the brahmaviharas, because, to be skillful, it requires a large element of wisdom. It’s a particular kind of acceptance. And it’s a particular kind of indifference. The acceptance here is that if you want happiness, you’ve got to do things to find that happiness. You accept the principle that your actions make the difference between whether your goodwill will actually be brought into reality or whether something’s going to get in the way. The indifference is indifference to ideas that would look for happiness in other ways, aside from your own actions — such as depending on some outside power or some outside being to come and do things for you. You have to be indifferent to those id...