Who said "Joy can't exist without the possibility of sadness."?

This quote is attributed to Riley.

Joy can't exist without the possibility of sadness. - Riley

"Joy can't exist without the possibility of sadness."

Riley Happiness

"Do you ever look at someone and wonder what is going on inside their head?"

"I miss home. I miss my old friends."

"Crying helps me slow down and obsess over the weight of life's problems."

"I'm not happy right now, and that's okay. Emotions change."

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."