There are two types of joy. There is joy created by selfishness, and there is joy created by bringing happiness to others. The following is a quote from the Osashizu December 11, 1897:
There is God-guided joy and self-serving joy. You cannot follow through with self-serving joy, even if you try to. Only when your joy brings joy to others, can it be called true joy. If you enjoy yourselves while causing others to suffer, this cannot be called true joy.