I was recently reminded of the power of criticism when two diametrically opposed viewpoints hit my email inbox on the same day. I will spare you the details, but one was highly complimentary of a website I maintain. The second was not so much so. While expressed as a concern, the uncomplimentary message evoked some pretty strong emotion from me. Frankly, it took me several hours to calm down enough to poll several folks I respect regarding the validity of the criticism. I was assured it was, in fact, baseless.

But here’s an interesting phenomena. While I was ultimately able to “chuckle” over the criticism, guess which one of those emails I spent the most mental and emotional energy on? If you guessed “the negative one,” you’d be correct.

Ironically (unless you believe in fate), a few days later I happened to listen to an inspiring TED talk. The speaker introduced the concept of “mental hygiene” noting that while we take care of our bodies with healthy practices, most people do not have a regimen that addresses mental health. One point that particularly hit home was that we human beings have a tendency to “ruminate” over incidents and conditions in our lives. (In animal terms, “chew over and over.”) His challenge was that we might do well to consider what we are consuming and chewing over and over. Our choices affect not only our mental state, but also how and what we communicate. And, of course, what we communicate dramatically impacts those we are around.

There’s both a personal and an organizational lesson for us in this. Chewing on the negative isn’t going to make it positive. Sometimes we have to spit it out and find something better to chew on. That is a choice we can make.

I substitute taught kindergarten recently. One of the things I love about five year olds is they haven’t get figured out why things can’t be done—they try stuff. One of my best moments was when a young lady came up and tugged on my sleeve. “Mr. Boomsma, I want to tell you about something nice (another student) just did for me…” We work really hard to create a positive learning environment at school. There are official positions assigned every day: class messenger (delivers notes to the office) and cubby inspector (makes sure no one has forgotten anything at the end of the day) are two. But my personal favorite is the kindness reporter. A different student each day is challenged to spot and report kindnesses happening in the classroom.

I wonder how our lives would change if we decided to be a “Kindness Reporter.” We could simply do it personally and randomly or we could self-appoint ourselves to the position with our family, our workplace, or organizations we’ve joined. Maybe we also could be a “Thinking Monitor”—someone who decides to point out negative thinking and try to stop others from chewing on it.

If you’re not willing to do it for others, at least do it for yourself. Monitor how you’re thinking and how much kindness you’re doling out. Chew on the positive possibilities. It will improve your digestion!