What is time?

Long ago, in an era bygone,
A light in a cave brightly shone
And an old man in it,in deerskin brown,
Sat on a stone sadly, as he felt let down
"Oh!", he cried, " Of what use is all this strife?
When I have wated my entire life
Oh! I have sure committed a great crime
By not thinking about 'What is time'!"
And slowly, as man's brain was lit,
With precious knowledge, bit by bit,
He sat in his room and pondered
And calculated and wondered,
Whether man's life did time shatter
Or whether it was nothing of matter.
Then came a man in white hair
whose wisdom he did with the world share,
Said he, "Space is a sheet and time is with it.
And all the other men, with concern writ,
Read slowly his lengthy proof,
And said, "I believe this, if not anything else under the roof!"
Decades later, a weak man in a wheelchair
Proclaimed, "Men! I'll tell you, if you care,
That what the white-haired man said was wrong
And I will prove it, no matter how long."
Years passed, and man said, "I sure will give you a dime,
If you pray tell me what is time!"
And then a voice boomed clear and loud,
And a light shone from the overhead cloud,
"Time is what you have presently lost,
And regaining it will come at a cost."