A fable from Baal HaSulam’s Igrot (Letters), Letter 26, pg. 85: A great good King had one purpose: to give pleasure to the citizens of his kingdom. He gave them an order to do work for him for a year and designated a special place for it in his palace. The reward was set up at the place of work where the King prepared meals with an abundance of various delicacies.
They all started to work and thought that the King would put guards over them to watch their work, but the King hid himself, and they could do as they pleased. They were not aware of the King’s invention, a seasoning, the healing powder that gave all the dishes filled with delicacies and sweets a bitter unpleasant taste. But in the place where people did work, this seasoning made the food taste divine!
Those who where loyal to the King, did the work as they were told and carried out the orders precisely, even without being watched. Thus, the healing dust filled their bodies. When the time of feast came, the workers were able to taste countless flavors and the sweetness they had never known before. So they constantly praised and thanked the King.
But those low workers who didn’t recognize the greatness of the King and that they should love him faithfully (because no guards were watching over them), disregarded the place of work and chose to work where it was more pleasant. So when the time of feast came, the food tasted horribly bitter because of the magic dust. They started to curse and berate the King and his feast because he prepared such a bad reward for their exertion. And for them, the King became a great liar for he gave them bitterness and salt instead of delicacies and sweets.
From the Daily Kabbalah Lesson 7/9/10, Baal HaSulam, Letter 26, pg. 85