When you get upset about somebody...

When you get upset about somebody, just be careful not to give into that emotion right away.
Take a full breath first, and then
Think who will be benefited if you hold onto that anger and express that anger.

Of course you may think, yes, I know it's the Devil who will be happy
But, that's not enough
Is there any particular person, or group of people around, who will get benefit out of it?
Of course the Devil may be happy, but the Devil cannot just be happy by himself.
There must be some substantial human being who would want to see you giving into that emotion
and let you fight with someone, and use all the resources of the both, and eventually both die...
Then he will take what he wanted
Are you really sure nobody has such intention around you?

Then, think again.

Because you know it is not reasonable to have such negative feeling toward someone
And in fact, you really do not want to do such a thing
But only for some reason which was instilled from somewhere, you find yourself opposing someone

Beware, somebody may be lying...

Anyway, I am not forcing my idea, but just think about it.