I started my career as a psychotherapist intending to help others build mental strength. I never imagined how much I was going to need mental muscle in my own life.

My mom passed away when I was 23. Then, my husband died when I was 26. Losing the two most important people in my life sent me on a quest to learn as much as I could about how to be mentally strong.

As I studied mental strength, I realized that mentally strong people don’t just have good habits. They also avoid any unhealthy habits that could hold them back.

In 2013, during one of my lowest points in my life, I wrote a letter to myself about all the things mentally strong people don’t do. When I was done, I had a list of 13 things that could rob me of mental strength if I let them.

That letter helped me so I thought maybe it could help someone else.

I published it online expecting a few people would read it. But that list went viral and more than 50 million people read!