Nothing can prevent the Lord from sending His miracles (that you are repeatedly asking for) to you. The fact is, the previous nations (such as the people of Pharaoh) denied such miracles (sending miracles, therefore, is not efficient.) I sent the famous camel (as a miracle) to the people of Thamood (for example;) they responded (to this miracle) by killing her! The main reason for sending the (past) miracles was to warn the people (so that they wake up from the hypnotic dream induced by Satan and come to their senses. What was needed in the time of Mohammad was a Book to relay the Lord’s Message to the entire humanity and to the generations to come, with a guarantee that it will never be falsified.)