A cheerful disposition is good for your health; gloom and doom leave you bone-tired. Proverbs 17:22 (TM)
My Grandpa Vander Well had a cheerful disposition. That’s him standing on Franklin Street in Pella during his Central College days (c. 1926). I can still remember him approaching life as if each day were an adventure for which he was perfectly prepared. Ask Grandpa how he was doing and his stock answer was, "never felt better!". Even when he and his wife were hit by a car and she was killed, even when he was going through a long rehabilitation, even when he was advanced in years and you knew his body was racked with pain he approached each day with a "never felt better!" attitude. Needless to say, he was an encouragement and inspiration to others into his nineties.
I contrast that with many I know who approach each day as though it was a battle they have already lost. Every day is "doom and gloom". Their glass is half-empty and they are sure someone drilled a small hole in the bottom to let out the rest. These people are not only tired out by their own pessimism and self-flagellation, but they also wear out all those around them.
I’m constantly telling call center agents that they can choose how they sound on the phone. I think the same is true for each of us. While we can’t stop bad things from happening to us, we can choose how we respond to the bad things that happen.