The 2 in my signature are definitely favorites. I have a white board in the barn that I put quotes on for myself and my students.
It currently has
"Choose your attitude at the door, your horse & instructor will thank you for it." - Me
"Keep your fears to yourself but share your courage with others." -Robert Louis Stevenson
"Only those who dare to fail greatly can ever achieve greatly" - JFK
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.