Answer:
You can only have it once you have given it.
What comes once in a minute, twice in a moment, but never in a thousand years?
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
What is it that given one, you’ll have either two or none?
As beautiful as the setting sun, as delicate as the morning dew. An angel's dusting from the stars. That can turn the Earth into a frosted moon.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.