My question is that in philosophy there is a doctrine "pragmatism" which define that "truth that we know today might be changed tomorrow as future is clearly uncertain. We try to discover things in every branch of knowledge just to solve the problems of today but we can be wrong in future". As we know that this is the principle on science, philosophy and in fact all knowledge is based. Now we come to Islam. Again we try to prove and defend the concept of God and other concepts by using reason of worldly knowledge that we know. Then how are we certain about those concepts as there are reasons against those concepts? How do we believe in them as eternal and never reversible facts when every truth can be changed?