L. Frank Baum

“ Dorothy was thinking so earnestly as they walked along that she did not notice when the Scarecrow stumbled into a hole and rolled over to the side of the road. Indeed he was obliged to call to her to help him up again.
"Why didn't you walk around the hole?" asked the Tin Woodman.
"I don't know enough," replied the Scarecrow cheerfully. "My head is stuffed with straw, you know, and that is why I am going to Oz to ask him for some brains."
"Oh, I see," said the Tin Woodman. "But, after all, brains are not the best things in the world." ”

“ One of the big trees had been partly chopped through, and standing beside it, with an uplifted axe in his hands, was a man made entirely of tin. His head and arms and legs were jointed upon his body, but he stood perfectly motionless, as if he could not stir at all.
Dorothy looked at him in amazement, and so did the Scarecrow, while Toto barked sharply and made a snap at the tin legs, which hurt his teeth. ”

“ Both Dorothy and the Scarecrow had been greatly interested in the story of the Tin Woodman, and now they knew why he was so anxious to get a new heart.
"All the same," said the Scarecrow, "I shall ask for brains instead of a heart; for a fool would not know what to do with a heart if he had one."
"I shall take the heart," returned the Tin Woodman; "for brains do not make one happy, and happiness is the best thing in the world." ”