Reminds me of that anecdote between the pilot and the surgeon, discussing on whether or not God really existed:

The pilot says to the surgeon, "I've logged a hundred flights to the heavens, sometimes reaching the edge of space, but I have seen neither God nor His angels and saints."

The surgeon, who was a Christian, answers him, "And I've operated on the brains of a hundred great men, but I have never seen a single thought."