To 'know Thyself' is considered quite an accomplishment.

I think you are wrong to want a heart. It makes most people unhappy. If you only knew it, you are in luck not to have a heart.

Dorothy said nothing. Oz had not kept the promise he made her, but he had done his best. So she forgave him. As he said, he was a good man, even if he was a bad Wizard.

A curious thing about Ugu the Shoemaker was that he didn't suspect in the least that he was wicked. He wanted to be powerful and great, and he hoped to make himself master of all the Land of Oz that he might compel everyone in that fairy country to obey him, His ambition blinded him to the rights of others, and he imagined anyone else would act just as he did if anyone else happened to be as clever as himself.

“And I,” declared the SawHorse, filling in an awkward pause, “am only remarkable because I can't help it.”

I think the world is like a great mirror, and reflects our lives just as we ourselves look upon it.

Familiarity with any great thing removes our awe of it.