The original NonZeroDay post [0] on Reddit. There are many variations of this productivity theme (Seinfeld etc) but the way this post is worded really hit me. I try and make progress on the book I'm writing every day - even if I just change one word, it's a NonZeroDay. Which then keeps me motivated to try harder the next day.

[0] https://www.reddit.com/r/getdisciplined/comments/1q96b5/i_ju...