The walls we build around us to keep sadness out also keeps out the joy.

Behind every sweet smile, there is a bitter sadness that no one can see and feel.
The deeper that sorrow carves into your being, the more joy you can contain.
It's sad to know I'm done. But looking back, I've got a lot of great memories.

The word 'happiness' would lose its meaning if it were not balanced by sadness.
One must not let oneself be overwhelmed by sadness.
You cannot protect yourself from sadness without protecting yourself from happiness.
The good times of today are the sad thoughts of tomorrow.

Don't cry because it's over, smile because it happened.