Feelings of anger, bitterness, and hate are negative. If I kept those inside me, they would spoil my body and my health. The are of no use.
You must not hate those who do wrong or harmful things; but with compassion, you must do what you can to stop them — for they are harming themselves, as well as those who suffer from their actions.
When you hate someone intensely, 80% of what you think is delusion.
In some places, there's the concept of one religion, one truth. In the Muslim world, there's the notion of Allah. The Western, multireligious modern society is some kind of a challenge to this. These, I feel, are the main causes [for terrorism], and, when combined with lots of anger and frustration, cause a huge amount of hate.
Infinite altruism is the basis of peace and happiness. If you want altruism, you must control hate and you must practice patience. The main teachers of patience are our enemies.