There is danger for him who taketh the tiger cub, and danger also for whoso snatches a delusion from a woman. - Arthur Conan Doyle

The emotional qualities are antagonistic to clear reasoning.

He is not a bad fellow, though an absolute imbecile in his profession. He has one positive virtue. He is as brave as a bulldog and as tenacious as a lobster if he gets his claws upon anyone.

I stooped under the rude lintel, and there he sat upon a stone outside, his gray eyes dancing with amusement as they fell upon my astonished features. He was thin and worn, but clear and alert, his keen face bronzed by the sun and roughened by the wind. In his tweed suit and cloth cap he looked like any other tourist upon the moor, and he had contrived, with that catlike love of personal cleanliness which was one of his characteristics, that his chin should be as smooth and his linen as perfect as if he were in Baker Street.