Anger is the Cause of our Problems

Having killed what
do you sleep in ease?
Having killed what
do you not grieve?
Of the slaying of what one thing
does Gotama 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.

-- Ghatva Sutta

Buddha was non violent in nature. However, he instructed us to destroy our anger. He didn't tolerated even a slightest bit of anger. That's why he avoids all issue of anger management—that modern psychologists proclaim—and says to kill the anger in it's very root.

So it's not ok to be angry. What to speak of suppressing anger like an neurotc person. Wise people approve the destruction of anger. But how exactly do we do that? We must stop feeding the anger with our attention. Instead, we should develop loving kindness to eliminate anger from our hearts.

The best way to do this is by chanting mantra sabbe sattā bhavantu sukhitattā constantly. The direct translation is "May all living beings be happy." In this way we will develop loving kindness and gradually overcome anger. Just like a strong animal, such as tiger, is killed by not feeding it, similarly anger is deprived of our awareness by being concentrated of thoughts of loving kindness. That's why metta mantra is the best tool for developing loving kindness.