"Nature Boy" is a song by Eden Ahbez, published in 1947. The song tells a fantasy of a "strange enchanted boy... who wandered very far" only to learn that "the greatest thing... was just to love and be loved in return".
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There was a boy,
a very small enchanted boy.
They say he wandered very far, very far,
over land and sea.
A little shy and sad of eye,
but very wise was he.

And then one day.
One magic day he passed my way.
And as we spoke of many things,
Fools and kings,
This he said to me.
The greatest thing you'll ever learn
is just to love and be loved in return.