Many of us take too much to heart.We pursue our interests in all earnestness, with a flatfootedness that denies our humanity, and humility.
Seriousness is a virtue, but even virtue can be immoderate. The somber, solemn and sober chase after goodness can be self-defeating. Levity is often called for in our undertakings. Humor will lighten even the most dire of circumstances.
A wholehearted committment to the most momentous of missions need not be followed in a stonyfaced manner. Nothing loses its significance or its gravitas when you crack a smile.