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It is the greatest and most often missed opportunity of our lives - to know, as the English poet William Blake said, what it is to have a firm persuasion, to feel you can move mountains. Now David brings Blake's words to the tasks that occupy most of our waking hours: "To have a firm persuasion in our work - to feel that what we do is right for ourselves and good for the world at exactly the same time - is one of the great triumphs of human existence."
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