Two Lists Diverged in a Yellow Wood
That list you keep titled "Impossible" is someone else's list titled "Yes it's hard but I'm going to try it anyway."
Talking to the guy, asking for a raise, starting a business, losing weight, visiting someplace new, launching that product, writing the script, calling her one last time, organizing your neighbors - you can deem these impossible all you want.
But someone else will try.
And that has made all the difference.