惟有义人必然欢喜，在神面前高兴快乐。

But may the righteous be glad and rejoice before God; may they be happy and joyful.

youdao

为什么他们高兴快乐事奉神呢？

Why do they serve with gladness?

youdao

它是你把另一个人的幸福看的和自己甚至是比自己的幸福更重要，是你所做的一切都是为了让他或她高兴快乐。

It's valuing someone else's happiness as much as, if not above, your own, and doing something merely to make that person happy.

youdao