What 5-minute action can you take at work today that will pay huge dividends and possibly change someone’s life?

Write a thank you note.

Yup, a thank you note. It can be by email, text, card or direct message. The medium doesn’t matter. What matters is taking the time to share with a colleague what you appreciate about them.

Science says so. Gratitude research is on the rise, according to Heather Murphy reporting in The New York Times. A recent study covered in Psychological Science asked participants to “write a short ‘gratitude letter’ to a person who had affected them in some way.”

Many of the note recipients said “they were ‘ecstatic,’ scoring the happiness rating at 4 of 5. The senders typically guessed they’d evoke a 3.”

The major finding of Dr. Amit Kumar at the University of Texas at Austin? “People tend to undervalue the positive effect they can have on others for a tiny investment of time.”

Dilbert creator Scott Adams put it well in his bestseller, How to Fail at Almost Everything and Still Win Big: Kind of the Story of My Life.

“Adults are starved for a kind word,” Adams wrote. “When you understand the power of honest praise (as opposed to bullshitting, flattery, and sucking up), you realize that withholding it borders on immoral. If you see something that impresses you, a decent respect to humanity insists you voice your praise.”

What else says so? My own experience.

Today is my last day at AT&T, which was DIRECTV before that. (Note: opinions expressed in this blog are my own.) It’s been a great run at a great company, and I’m excited to move on to the next stage of my work life. But it’s bittersweet to leave an incredible group of colleagues.

When my departure note went out, I thought a few people might reach out to say farewell.

What I wasn’t prepared for was the outpouring of appreciation. And thanks. And love.

(And in the #MeToo era with so much bad behavior, I must qualify that to note what I experienced was entirely professional and fully within the bounds of respectful and appropriate workplace behavior.)

What caught me completely by surprise is a stack of now-printed emails with thanks and good wishes that I’m saving for posterity. I share a few excerpts anonymously here, with the hope the writers do not mind and that their thoughts might inspire you to thank a colleague today, and every day …

Thank you for making us smile and wanting to do our jobs. You are an amazing leader who leads by example. 

I always enjoyed your leadership and especially looked up to you in so many ways, hoping that I could be half of what you are in my lifetime. 

Did you hear that?! That was the sound of my heart breaking. While our work together was short lived and limited (much to my dismay), you truly made an invaluable impact and for that I thank you.

On behalf of all the people you have inspired, but are probably unaware of, thanks for all you do. 

It’s been my biggest pleasure and honor to work with you.

I’m sure you don’t remember me, but you had lunch with a small group of new hires during our onboarding. We had a lovely conversation and I was so impressed and grateful for how welcoming and inclusive you were with us.

You’ve had such a profound influence on my life and I am so grateful for that. 

Wow.

I had no idea.

And maybe the people you work with have no idea either … of how talented, valued and appreciated they are. So I encourage you, every day, to share your thanks with at least one person. It reminds me of what a wise colleague, Andy Bailey, always used to say – start every meeting with recognition.

Here’s my love letter to all the amazing people I’ve worked with over the years, from a real-estate developer to what became Northrop Grumman, and from to DIRECTV to AT&T …

 Friends,

You are the reason I enjoy coming to work every day.

You are my “why” for being at work … the purpose that is bigger than all of us. You bring the ideas, the inspiration and the innovation that make our teams a success. You make the seemingly impossible suddenly possible. You make the workday fun, yes fun.

There’s a lot of hard work behind what you do. But you take the high road every day, making your hard work appear effortless and going above and beyond to deliver for colleagues and customers.

I have learned so much from you, whether a new skill set in a new role or a better way to lead and engage people. Maya Angelou was on to something when she said that people won’t remember what you said or did, but they’ll never forget how you made them feel. You make me feel like anything is possible, that there is good in the world, and that the present and future are exciting places. 

You have given me many gifts over the years. The most important ones? The feeling that I have made – and will continue to make – a difference. The knowledge that each of us leaves bigger footprints in the sands of time than we can ever know. That quite possibly is the best gift ever. It speaks to our humanity and our desire to be part of something larger than ourselves.

I am ever grateful, and I ask that you keep paying it forward.

Who has made a difference in your work life? Who will you reach out to today?