Nothing valuable or great was ever discovered by quitting.

The United States is a successful nation that is constantly susceptible to melancholy because things are not perfect.

It is common to seek perfection, but it is stupid to believe that you will ever reach it.

[Alexander von Humboldt was the] greatest scientific traveller who ever lived.

I know more polkas than Frankie Yankovic. I grew up next door to the Polka Tavern in Milwaukee. I can sing some polkas. And proud of that.

Jeez banana! Shut your freaking gob!

Everything is possible if you try enough so if something doesn't work out, you're not trying enough.

I can be trained, I can actually show you how intelligent I am, I can use a word like delicatessen and know what it means.

I think too many people look at the arts with a religious outlook. Arts, music, singing and performing, it's all make-believe.

The extraordinary woman depends on the ordinary woman.

Accept the priceless gift - the joy of work. Apply the greatest value in life: love people and serve them. You will attract big and generous portions of success.