Part of the mind will say, “But look at all these horrible people and what they’re doing.” Well, that’s their business. That’s their kamma. You don’t have to go around collecting other people’s bad kamma and weighing yourself down.

"Learn how to speak to yourself in a way that shows compassion, that shows goodwill [mettā], really does wish for your true happiness. A part of the mind has a tendency to believe in the negative things more than in the positive, so it feels fake to remind yourself of how much you really do want true happiness. But don’t you want true happiness? Can’t you allow yourself to think that thought? Part of the mind will say, “But look at all these horrible people and what they’re doing.” Well, that’s their business. That’s their kamma. You don’t have to go around collecting other people’s bad kamma and weighing yourself down.

Take a couple of good, long, deep breaths again. Air things out. Think about how petty a lot of the issues are that you get worked up about — the things that people say and do. You know that ten years from now you’re going to totally forget them. Or you’ll look back on today and say, “How could I let myself get so worked up about those things? Why did I waste my time?” So try to take a longer view of the day. It’s not just today. You’ve got a whole life, and it’s a being eaten away day by day by day. Do you want it to be eaten up by these things?

Take a couple of good, long, deep, in-and-out breaths again. In other words, learn how to talk to yourself in a way that’s really helpful until you can decide that, yeah, you are ready to let go of the issues of the day, and try to get back to your home base, which is the breath."

~ Thanissaro Bhikkhu "After-work Meditation"