A man goes to ask the great guru

A man goes to ask the great guru, “Which is better, large melons or small melons?”

The great guru asks him “How much money do you have in bills in your wallet?”

The man quickly counts the money.

“Thirty dollars.”

“And if you had thirty dollars in coins,” said the guru, “which would have the greater mass the coins or the bills?”

“The coins of course.”

“But which would have the greater value?”

At this moment, the man was enlightened.