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The interpolated phrase "and he would have succumbed", is, according to Zamakhshari, implied in the above sentence. In his commentary on this verse, he further points out that the moral significance of "virtue" consists in one's inner victory over a wrongful desire, and not in the absence of such a desire. Cf. the well-known saying of the Prophet, recorded, on the authority of Abu Hurayrah, by Bukhari and Muslim: "God, exalted be He, says: 'If a servant of Mine [merely] desires to do a good deed, I shall count this [desire] as a good deed; and if he does it, I shall count it tenfold. And if he desires to commit a bad deed, but does not commit it, I shall count this as a good deed, seeing that he refrained from it only for My sake...'" - i.e., in consequence of a moral consideration (which, in the present instance, is described as "an evidence of God's truth").
Lit., "he was among Our sincere servants".
Joseph (ﷺ) received warning against fornication either through divine inspiration or a vision of his father.
She was blinded with passion, and his plea had no effect on her. He was human after all, and her passionate love and her beauty placed a great temptation in his path. But he had a sure refuge,-his faith in Allah. His spiritual eyes saw something that her eyes, blinded by passion, did not see. She thought no one saw when the doors were closed. He knew that Allah was there. That made him strong and proof against temptation.
The credit of our being saved from sin is due, not to our weak earthly nature, but to Allah. We can only try, like Joseph, to be true and sincere; Allah will purify us and save us from all that is wrong. Tempted but true, we rise above ourselves.