If Allah has a plan, what is the point of Dua?

[Sheed1980]

Allah already knows what will happen and it's all part of a grand scheme. So why make Dua (supplementary prayers)? Are we hoping to change the mind of Allah by praying? Have Allah cure us of the illness or cancer that was given to us, by it, as part of our personalized plan perhaps?

Allah gives a human cancer and then we beg extra hard for our Cancer to go away. That's so egotistical. Remind me, what was the point of cancer again?

Oh right, to test us in this Dunya. Why can't humanity have less painful tests? Like an exam maybe? An exam on Quran before entering Jannah perhaps?

Yes Allah is All Knowing, Wise. But we aren't. We don't know what is going to happen to us. Or how it's going to happen. But with Allah's mercy He gives us free will to live our lives as we wish. By Him being All Knowing He knows we can't do an atom's weight of anything against His will. So He tells us He accepts prayer and answers prayer, accepts sincere repentance (except dying in the state of unbelief and shirk). So will we have faith in Him as our Lord and creator and seek His knowledge, forgiveness and guidance? Also He being The Most Merciful, He expiates sins from His believing servants for any hardships(non intentionally)we go through. Sickness, sadness, pain, struggle, u name it. The Prophet Muhammad pbuh said " if a Muslim feels so much as the prick of a thorn Allah expiates some of his sins". The Prophet Muhammad pbuh also said"A Muslim loses their sins like a tree loses its leaves". So Allah tests us to see if we will seek His forgiveness, help, and guidance, or will we be arrogant, and try doing it ourselves without His help which absolutely will not happen. And to answer ur question about the cancer. There are things that Allah does that go beyond our understanding. Because all of us as humans commit sins, and since cancer is a type of hardship Allah may possibly use it as a purgation or cleansing of sins from our souls in this life and out of His mercy, prevents us from the punishment of hellfire in the Hereafter. We have to always remember. We have plans and Allah has plans, and Allah is the best of planners.