With help of Allah imam mahdhi (a) is protected. If someone can disturb or attack him ,then the foretellings become false. So do not be fear on,of the power of Allah(swt).
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Allah sends rasools and nabi with wahi to the different areas of the world time to time to make mankind to be truthful to Allah and show the right path.
And most of wahis are written with the thoughts of the book or another person I accept. And some religious books are about the history of the time written.(mahabaratham)
I like to tell here that I dont' and never try to tell as every religion are similar. Why I like to take an example from hinduism here. Their one of gods is" kali". Kahli is a women with a appearance of ghost. And it is a shaithan they worship shaithan so how it can be similar to us. And buddha dod'nt tell as he is the god at any place.
And I come to the your point. I know that quran is an ocean.and if we start to read quran we read everything. But ,you should understand something that. For a person who is reading the quran cannot understand it's full meaning without seeing at Allah's creations and hadees. And Allah say on quran to go around the world do see the creations of Allah. And Allah tells about the people of saba and why Allah mention it on quran? To see the place understand the power of the Almighty!!!
And I dont like to stay in a limited circle. I always like to do research and increase my knowledge. If islamic schorals didn't think more and spend their time only with praying and zikr we cannot see an Ibn sina or zahravi now.
And you do not forget searching knowledge also a ibadah. And Allah told us to spread on earth and search the knowledge.
I am very sad on people who tells me to do not think. That s why still muslims in the border of technology.we have given a big miracle but we are not thinking. Merely reading a thafseer is not enough to me. I want to see,i want hear and I want explore and I will do Insha Allah.
And do not stop the people with a great goal by your waste words. If you do you are about to stop the power of a generation.