as it is stated in quran that allah reaveals to humans about the specific knowledge or idea he wants
Well, according to the holy Gospel of FSM it is the one and only FSM that reveals specific knowledge and ideas to humans as it sees fit. And I have holy Gospel of FSM to prove it.
i bet newton saw an apple falling from tree for several times but y was it that particular moment that he hit the idea about gravitaion.
That's because FSM saw fit to reveal that specific idea to Newton at that specific time precisely.
To ask why or to doubt that is blasphemy btw.
And you know where blasphemy leads don't you?