For the very fact that birds do build nests is one of those similarities that sharpen the startling difference. The very fact that a bird can get as far as building a nest, and cannot get any farther, proves that he has not a mind as man has a mind; it proves it more completely than if he built nothing at all. If he built nothing at all, he might possibly be a philosopher of the Quietist or Buddhistic school, indifferent to all but the mind within. But when he builds as he does build and is satisfied and sings aloud with satisfaction, then we know there is really an invisible veil like a pane
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