Examples of Willy's contradictory statements?

Linda: He's finding himself, Willy. (about Biff)
Willy: Not finding yourself at the age of thirty four is a disgrace!
Linda: Shh!
Willy: The trouble is he's lazy, goddammit!
Linda: Willy, please!
Willy: Biff is a lazy bum!
Linda: They're sleeping. Get something to eat. Go on down.
Willy: Why did he come home? I would like to know what brought him home.
Linda: I don't know. I think he's still lost, Willy. I think he's very lost.
Willy: Biff Loman is lost. In the greatest country in the world, a young man wuth such--personal attractiveness, gets lost. And such a hard worker. There's one thing about Biff--he's not lazy.

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Willy: And don't say "Gee." "Gee" is a boy's word. A man walking in for fifteen thousand dollars does not say "Gee!"
Willy: Gee, look at the moon moving between the buildings!

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"Chevrolet, Linda, is the greatest car ever built."

"That goddam Chevrolet, they ought to prohibit the manufacture of that car"

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" bigger than Uncle Charley! Because Charley is not - liked. He's liked, but he's not - well liked"

The cause is Willy's instability and inability to communicate his thoughts. Willy is in a state of confusion.