I will make you a present of a secret. - Antoine de Saint-Exupéry

"That was how the little prince tamed the fox. And when the time was near:
"Ah!" the fox said. "I shall weep."
"It's your own fault," the little prince said. "I never wanted to do you any harm, but you insisted that I tame you...."
"Yes, of course," the fox said.
"Then you get nothing out of it?"
"I get something," the fox said, "because of the color of the wheat." Then he added, "Go look at the roses again. You'll understand that yours is the only rose in all the world.

Then you shall judge yourself,' the king answered. 'that is the most difficult thing of all. It is much more difficult to judge oneself than to judge others. If you succeed in judging yourself rightly, then you are indeed a man of true wisdom.

il n'est ni sagesse, ni calcul, ni science de l'eau quand elle dissout les digues et engloutit les villes des hommes.
(chapitre XV)