At times we can find ourselves constantly thinking about the past, the what-ifs, what went right, what went wrong, etc. It seems that while we do need to learn from the past, we do need to live in the moment.
This quote puts this into a simpler sentence and gives you a nice perspective on how you can view the way you live your life.
"Life can only be understood backwards; but it must be lived forwards."
Soren Kierkegaard (1813 - 1855)