Anne Frank was 15 years old when she died in a Nazi concentration camp. Yet her words outlived her body. Words scribbled in a diary from a secret attic in Amsterdam became one of the world’s most powerful mirrors.

This summer, I found myself in Amsterdam for Mindvalley U. By chance, my Airbnb was on the street next to Anne Frank’s house. Each morning, I’d step outside and see the same canals, the same cobblestones, and the same rooftops Anne may have glimpsed in stolen moments when she dared ...