“You cannot protect yourself from sadness without protecting yourself from happiness.”
I think it is often our first instinct to want to close up our hearts after we have felt sadness. It isn’t a good feeling and really, who wants to experience that pain again so instead we want to protect our hearts. If you don’t open yourself up, you can’t be hurt. But if you don’t open yourself and your heart up you also miss out on the chance to feel love and happiness.