This quote implies that the person who is able to triumph, or accomplish a beneficial outcome, is the one who will certainly be able to laugh as well as celebrate the longest. It suggests that success or victory typically comes to those that continue to be client, perseverant, as well as determined up until the end.
"Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday"