In Letter 181 the reason for Saruman's fall is given as; impatience > forcing others to do what they think is good > by any means making their will effective. Since they were clad in bodies, they were subject to sin like other incarnates, as well as weariness, pain, et cetera.
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"For believe me: the secret for harvesting from existence the greatest fruitfulness and the greatest enjoyment is - to live dangerously!" - G.S.; F. Nietzsche
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