What is the point of praying?. ( Luke 18 v 1 )

I want us to consider prayer ,why do we have to pray?,will it make any difference?, and the answer is yes. I found some helpful insight from Alec Motyer , ''We are aware that the Lord knows the end from the beginning and that he  has not only planned both  the beginning and the end but also plotted the course in between.'' Now that is where many people stop, seeing  prayer as a pointless exercise , but    A.M goes on to say,''There is at the heart of Gods changelessness a ,' mystery', a revealed secret, that the sovereign,unchangeable God accomplishes his purposes through the prayers of his people'' We see this throughout the scriptures,Gods people pray, for deliverance, healing,guidance, so on.                                                                                                                                                                                                                                              Alec Motyer.                                                                                                                       '' Prayer is one of the 'laws of God' by which he                                                                                           runs his world.''