One of my favorite poems by Carl Sandburg from his book, Chicago Poems.

HAPPINESS

I ASKED the professors who teach the meaning of life to tell
me what is happiness.
And I went to famous executives who boss the work of
thousands of men.
They all shook their heads and gave me a smile as though
I was trying to fool with them
And then one Sunday afternoon I wandered out along
the Desplaines river
And I saw a crowd of Hungarians under the trees with
their women and children and a keg of beer and an
accordion.