> It is better to weep with wise men than to laugh with fools.

-- Spanish Proverb

I agree, especially since the fools are the major source of things to weep about.

A happy idiot I guess. Since the miserable know-it-all is actually also an idiot, they just don't know it. So they're just a miserable idiot.

Can you really know-it-all? I mean really, whole Universe with its infinity in all depth and dimension? No, this is what makes you miserable not the knowledge itself - but taking on an impossible quest and knowing it but pretending you don't know.

Perhaps the know-it-all is miserable because they’re acutely aware that they’re outnumbered by happy idiots?