This is such a good quote!
Everyone goes through bad times. It is just a part of life. Some people relive the pain over and over again tormenting themselves while, what some call wise people, know when and how to let it go. They somehow figure out how to get out of the bad time.
Letting go and moving on is what is best for our body and soul. If you are going through something, figure out a way to let it go.