It's a command, not a suggestion

A question in the book Idols of the Heart asks what does God desire. One thing He desires is that we serve him with joy.

^{Deuteronomy 28: 47} “Because you did not serve the LORD your God with joy and gladness of heart, for the abundance of everything,"....

It was something He wanted. Seriously.

It's not an option. It's not selfish. It is when we are living in His reality.