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If a man happens to obtain the true knowledge of qadar, the knowledge surely brings him a perfect peace of mind and an intolerable pain at the same time. The unusual peace of mind arises from the consciousness that everything in the world occurs as it has been determined from eternity. And whatever may happen to himself or others, he will be perfectly content with it. Instead of struggling in vain for obtaining what is not in his capacity, he will be happy with anything that is given him. He must be tormented, on the other hand, by an intense pain at the sight of all the so-called 'injustices', 'evils', and 'sufferings' that reign rampant around him, being keenly conscious that it is not in his 'preparedness' to remove them from the world.
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Toshihiko Izutsu (Sufism and Taoism: A Comparative Study of Key Philosophical Concepts)