Answer
Salam Dear Ebenezer,
Thank you for your question and for contacting Ask About Islam.
We know that neither this world nor our life here is perfect. As humans living on this planet we are subject to all kinds of shortages, setbacks and disadvantages.
This is as well as problems in all areas of our life including health. Our study of religion as well as our own day-to-day experience teaches us to resort to the best course open before us in order to resolve the problems we face.
In the case of physical sickness, Islam teaches that we should adopt the best available medical treatment as well as pray to Allah. The command to pray is relevant not only in the case of physical sickness, but also in the case of all human endeavors.
This is because we are incapable of achieving anything on our own, without the help of God, the One and Only Creator and Sustainer of all. That is to say, we should never think that we are self-sufficient and we can manage all our affairs ourselves.
One of the definitions of a miracle is: “an extraordinary event manifesting divine intervention in human affairs” (Merriam Webster Online Dictionary). A Muslim who peacefully submits to God needs to believe that God is Ever-Watchful and nothing happens except by His leave.
Speaking of the miracles of Jesus, such as restoring a dead man to life or curing the leper and the blind, Allah in the Noble Quran tells us that Jesus could do so only by leave of Allah. Jesus tells his people what means:
{I have come to you, with a sign from your Lord, in that I make for you out of clay, as it were, the figure of a bird, and breathe into it, and it becomes a bird by Allah’s leave: And I heal those born blind, and the lepers, and I quicken the dead, by Allah’s leave; and I declare to you what ye eat, and what ye store in your houses. Surely therein is a sign for you if ye did believe.} (Aal-`Imran 3:49)
In other words, those miracles performed by Jesus were Allah’s miracles and He willed them to happen by the hands of Jesus. To Christians this may be proof that Jesus is God; but to Muslims this is proof that Allah Almighty Who let the miracles happen is God. And, that God, the One and Only Creator and Sustainer, chose Jesus to implement the miracle because he (Jesus) was a true chosen prophet of God. If the Christian argument were true, we should concede that Moses also was God; as he too did many miracles, by leave of Allah.
Your question, for instance, is about a person who used to be blind and says now that he was cured by Jesus. We are aware of many such sayings coming from people who are superstitious about miraculous powers imagined to be vested in certain people. Yet, we are not aware of their proofs.
Till your friend gives you a proof, what he says remains a claim. Before that, what is there to discuss or study? For example, there are thousands of people in India right now who believe in the miraculous powers of a “god-man” called Sai Baba.
Please notice that it was none other than Jesus Christ who warned about false prophets and false Christs who may apparently perform miracles as wonderful as those shown by Jesus himself.
“For there shall arise false Christs, and false prophets, and shall show great signs and wonders; so as to lead astray, if possible, even the elect.” (Matthew 24:24, American Standard Version).
This means we should take care not to believe the claims about “miracles” performed by any one in these times.
And Allah knows best.
Thank you and please stay in touch.