And how would you know? -- maybe he would grow in purit
Sayyed Abbas Sadr-Ameli
And what would make you know that he might (spiritually) purify himself
Al-muntakhab fi tafsir al-Qur'an al-Karim
"You Muhammad do not know; he -the blind man- may well hug faith to his innermost thoughts and to his innermost being and commend his secret feelings to Allah