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In plain words

"God laughs on two occasions. He laughs once when a physician says to a sick man's mother, 'Mother, why be afraid? I shall cure your son.' His thought is, 'I am about to take the boy, and here is this fellow promising to save him!' The physician fancies himself the doer and forgets that the doer is God. He laughs a second time when two brothers lay down a cord and part the land between them, one saying, 'This side is mine,' the other, 'That side is yours.' Then He laughs and thinks, 'All this universe belongs to Me, yet they claim this plot for one and that for the other!'"