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.
Greatly begin. Though thou have time but for a line be that sublime. Not failure but low aim is crime.
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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.