"Because Berkeley made an invariable practice of going through doors instead of walls.

Because he trusted his life to solid bread and butter and roast beef.

Because he shaved himself with a razor that worked when it removed the hair from his face." "But those are actual things!" Dr.Hammerfield cried.

"Metaphysics is of the mind." "And they work--in the mind ?" Ernest queried softly.
The other nodded.
"And even a multitude of angels can dance on the point of a needle--in the mind," Ernest went on reflectively.

"And a blubber-eating, fur-clad god can exist and work--in the mind; and there are no proofs to the contrary--in the mind.