Because the blind (2) man came to him.
2. It means his coming to you is an act of worship, and you should be happy about worship and not displeased. Also, that blind person reached you with much difficulty. He had no eyes so he was unable to obtain your address from anyone, otherwise the infidels would have told him. Also, because of his blindness he was unable to see the signs of anger on your illuminated face. Also, the one who has become blind out of intense love for you is fully pardoned about the etiquettes of gathering, talking without seeking permission, etc. Rules are for those who are intelligent, not for those who have lost their intellect in love. The Egyptian women cut their fingers on seeing the beautiful face of Hazrat Yusuf (On whom be peace), which was not regarded as sinful.
3. But what could convince you that he may be seeking to purify himself.