as the price paid for joy, as one defines the other.

Taoists believe that everything is just as it should be. Nothing is "suffering."

Here're a couple of links that might explain it better than I can:

https://en.wikipedia.org/wiki/Three_vinegar_tasters#Taoism_(Daoism)

https://www.thechurning.net/there-are-no-opportunities-or-threats-the-parable-of-the-taoist-farmer/

as an example of the mutual interdependence of polar opposites, a basic of Taoism. Both good and bad arise together. Without one there would no reason to name it or the other. If all luck was good it would not need a name. Names are only symbols used to separate. Without bad luck there would no reason to name good luck. The farmer understood that when his neighbors told him he was lucky and when they thought he was unlucky. The farmer knew they were like heads and tails of the same coin. That is the Yin and Yang.