It was truly an interesting topic. And your choice of quotes will surely hit hard not only you but all the people who can read it.
Mine is this:
Are you familiar with the Anime entitled One Piece? The quote or the line I've been living up to since the day I've encountered is that "What's Gone is Gone". Or same as What's done is Done. Lots of people around me wonders how I recover fast whenever I experienced downfall, how fast I move on. This quote is the reason. I cannot bring back what happened or wish that it didn't happened. The only thing I can do is to think about the present and the future. I refused to look back but I will never forget the lesson it taught me. For all circumstances, this is the only quote I always apply to keep me going.
RE: 200 Deep Questions to Ask : "What quote resonates with you more than any other?"