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Should the Muslims be victorious all the time, great many pretenders to Faith will enter the fold of Islam, and consequently the clear line of demarcation between true believers and hypocrites will become blurred. Contrarily, if the Muslims were to be defeated all the time, the final objective of the ministry of Prophets will not be effected. It is wise then to combine both success and failure so that sifting between true Muslims and hypocrites could be realized.
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Safiur Rahman Mubarakpuri (The Sealed Nectar: Biography of the Noble Prophet: Ar-Raheeq Al-Makhtum (The Sealed Nectar): Biography of the Prophet)