"Reason is itself a matter of faith. It is an act of faith to assert that our thoughts have any relation to reality at all.
If you are merely a sceptic, you must sooner or later ask..., 
Q: 'Why should anything go right; even observation and deduction? Why should not good logic be as misleading as bad logic?
Q: They are both movements in the brain of a bewildered ape?'
The young sceptic says, 'I have a right to think for myself.'
But the older sceptic, the complete sceptic, says, 'I have no right to think for myself; I have no right to think at all."
G. K. Chesterton