Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against ...

Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning? (Frank Herbert)

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Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?

Frank Herbert Quotes: Duncan, have I not told you that when you think you know something, that is a most perfect barrier against learning?