" Jesus put it this way: “Stop allowing yourselves to be agitated and disturbed” (John 14:27 AMP).
Notice it’s a choice we have to make. He didn’t say, “I will make sure your circumstances are perfect. That way you can be happy.”
He said, in effect, “The things upsetting you right now don’t have to upset you. The people aggravating you, even if they don’t change, they don’t have to aggravate you.” If you’ll make adjustments and change your approach to life, you can be happy in spite of those circumstances.
I’m asking you today to stop allowing negative people and disappointments and inconveniences to steal your joy. You have to put your foot down and say, “This child gets on my nerves—I love him—but I will rise above it. I won’t let this control me.” Or, “This grumpy boss jumps down my throat for no reason, but I’m not letting him ruin any more of my days.” That’s what it means to not give away your power. You have to be determined to enjoy your life. "

― Joel Osteen , Every Day a Friday: How to Be Happier 7 Days a Week