"All work and no play makes Jack a dull boy."
Just because we are given responsibility does not mean that we have to become serious and severe. We can have a high-integrity work ethic and high-intensity work and still have fun at the same time.
Learning to mix pleasure with our have-tos is a valuable practice, both for ourselves, and for those with whom we are engaged. It is the mix that's needed and the mix that's appreciated and the mix that brings enjoyment to the path.
I am able to be productive and efficient but still maintain my lightness and my good humor and my lively sense of play.