The freedom to fail is vital if you're going to succeed. Most successful people fail from time to time and it is a measure of their strength that failure merely propels them into some new attempt at success.
Mohammed was not an apparent failure. He was a dazzling success politically as well as spiritually and Islam went from strength to strength to strength.
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No matter how vast how total the failure of man here on earth the work of man will be resumed elsewhere. War leaders talk of resuming operations on this front and that but man's front embraces the whole universe.