Do you believe you need to know sadness in order to appreciate happiness?
No, you don’t necessarily need to experience sadness to appreciate happiness. You can still know what happiness means without ever being sad.
However, you may be more appreciative of happiness if you know what it really means to be sad. I’m appreciate happy times more because I’ve had some really sad days.
It’s all about balance. We can’t have sunshine all of the time. We need rainy days too.