A witness in the sense that I am using the word is a man whose life and faith are so completely one that when the challenge comes to step out and testify for his faith he does so disregarding all risks accepting all consequences.
All the strength and force of man comes from his faith in things unseen. He who believes is strong he who doubts is weak. Strong convictions precede great actions.
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Moderation is part of faith so those who accuse Muslim schools of fostering fanaticism should learn a bit more about Islam.