As to Muhammad and miracles, I would love a chapter/verse which states what you are stating here. .
Quran: 7:188
Sahih International: Say, “I hold not for myself [the power of] benefit or harm, except what Allah has willed. And if I knew the unseen, I could have acquired much wealth, and no harm would have touched me.** I am not except a warner and a bringer of good tidings to a people who believe.”**
Pickthall: Say: For myself I have no power to benefit, nor power to hurt, save that which Allah willeth. Had I knowledge of the Unseen, I should have abundance of wealth, and adversity would not touch me.
I am but a warner, and a bearer of good tidings unto folk who believe.
Yusuf Ali: Say: "I have no power over any good or harm to myself except as Allah willeth. If I had knowledge of the unseen, I should have multiplied all good, and no evil should have touched me:
I am but a warner, and a bringer of glad tidings to those who have faith."
Shakir: Say: I do not control any benefit or harm for my own soul except as Allah please; and had I known the unseen I would have had much of good and no evil would have touched me;
I am nothing but a warner and the giver of good news to a people who believe.
Muhammad Sarwar: (Muhammad), say, "I have no control over my benefits or sufferings, without the will of God. Had I known about the unseen, I would have gained much good and would have faced no suffering.
I am only a warner and I preach the glad news to the believing people."
Mohsin Khan: Say (O Muhammad SAW): "
I possess no power of benefit or hurt to myself except as Allah wills. If I had the knowledge of the Ghaib (unseen), I should have secured for myself an abundance of wealth, and no evil should have touched me.
I am but a warner, and a bringer of glad tidings unto people who believe."
Arberry: Say: 'I have no power to profit for myself; or hurt, but as God will. Had I knowledge of the Unseen I would have acquired much good, and evil would not have touched me. I am only a warner, and a bearer of good tidings, to a people believing.'