In other words, the more stupid one is, the more he thinks he knows.

To 'know Thyself' is considered quite an accomplishment.

Time is given us to be happy and for no other reason [...] When we waste time, we waste happiness.

If your heads were stuffed with straw, like mine, you would probably all live in the beautiful places, and then Kansas would have no people at all. It is fortunate for Kansas that you have brains.

The road to the City of Emeralds is paved with yellow brick.

That proves you are unusual,' returned the Scarecrow; 'and I am convinced that the only people worthy of consideration in this world are the unusual ones. For the common folks are like the leaves of a tree, and live and die unnoticed.

One can be ugly in looks, but lovely in disposition.