Reason can come from reason.
That makes sense.
But what about when someone asks you to go further?
This is where morality becomes a giant void.
In Miracles, C. S. Lewis takes this kind of thinking to task: “Reason might conceivably be found to depend on [another reason] and so on; it would not matter how far this process was carried provided you found Reason coming from Reason at each stage. It is only when you are asked to believe in Reason coming from non-reason that you must cry Halt.”
–Ravi Zacharias, The End of Reason