Scepticism is not irrefutable, but obviously nonsensical, when it tries to raise doubts where no questions can be asked. For doubt can exist only where a question exists, a question only where an answer exists, and an answer only where something can be said. (6.51)
Knowledge is in the end based on acknowledgement.
Religion is, as it were, the calm bottom of the sea at its deepest point, which remains calm however high the waves on the surface may be.