Philosophy

This is part of my writings based on The Problems of Philosophy book. More details about it are here, Also you can follow the other related posts here. Is there any certain and definite knowledge that any reasonable person could not doubt it? For a single person, I would say

I read The Problems of Philosophy book some years ago. But decided to review the book and my notes and answer some of the questions made in the book from my view. There is an anecdote in which a person says to another person that Quran (the holy book of