The miracles performed by Christ proved his divinity; they were designed to confirm the truth of his Messiahship, as well as to benefit those who became the subjects of his miraculous power.
We have the same evidence now. From the continuance of Christianity after all opposition and the miracles of grace constantly being performed there is sufficient evidence to induce to Christian discipleship.
This question was proposed to the Pharisees, by the man whose eyes Christ had opened they wanted the miracle not to be true. The healed man upbraids them for their willful and unreasonable opposition to the evidence of this miracle. He would not gratify them with a repetition of the story.
The text, on the part of the man, seems to imply:
(1.) Conviction. He who has opened my eyes, must be God.
(2.) Decision. As he has declared himself to be God in my case I will be his disciple.
(3.) Benevolence. "Do you also want to become His disciples?"
[William Nicholson]

John 9:25-27 ... He answered and said, Whether he be a sinner or no, I know not: one thing I know, that, whereas I was blind, now I see. Then said they to him again, What did he to thee? how opened he thine eyes? He answered them, I have told you already, and ye did not hear: wherefore would ye hear it again? will ye also be his disciples?❤