The Parable of the Poisoned Well:
“There was once a wise king who ruled over a vast city. He was feared for his might and loved for his wisdom. Now in the heart of the city, there was a well whose waters were pure and crystalline from which the king and all the inhabitants drank. When all were asleep, an enemy entered the city and poured seven drops of a strange liquid into the well. And he said that henceforth all who drink this water shall become mad.
All the people drank of the water, but not the king. And the people began to say, “The king is mad and has lost his reason. Look how strangely he behaves. We cannot be ruled by a madman, so he must be dethroned.”
The king grew very fearful, for his subjects were preparing to rise against him. So one evening, he ordered a golden goblet to be filled from the well, and he drank deeply. The next day, there was great rejoicing among the people, for their beloved king had finally regained his reason.”
“A time will come when the whole world will go mad. And to anyone who is not mad they will say: ‘You are mad, for you are not like us.'”
~ St. Anthony the Great (attributed to)