This poem comes from Autumn Leaves:

Brighter than a falling meteor,

Shorter than an excited breath,

More fleeting than a passing moment,

Faster than a bolt of lightning.

Colder than a frigid arctic blast,

Higher than an eye straining cloud,

Softer than wind-blown thistledown,

Harder than the hardest diamond.

This entity comes quietly, yet quickly.

Lingers softly, burns hotly, turns cold

And leaves faster than it came.

Having brought joy with its arrival,

It now leaves sorrow in its wake.

Not to know it brings emptiness,

And to know it brings joy and bittersweet memories!

Such is this thing known throughout the world as Love…

And stranger still — no one can define it.