"But what does that mean ‘ephemeral‘?" repeated the little prince, who never in his life had let go of a question, once he had asked it.
"It means, ‘which is in danger of speedy disappearance.’"
"Is my flower in danger of speedy disappearance?"
"Certainly it is."
"My flower is ephemeral," the little prince said to himself, "and she has only four thorns to defend herself against the world. And I have left her on my planet, all alone!"
That was his first moment of regret. But he took courage once more. "What place would you advise me to visit now?" he asked. "The planet Earth," replied the geographer. "It has a good reputation." And the little prince went away, thinking of his flower. - P84