Progress is impossible without change, and those who cannot change their minds cannot change anything. – George Bernard Shaw

Orthodoxy: That peculiar condition where the patient can neither eliminate an old idea nor absorb a new one. – Elbert Hubbard, The Note-Book, 1927

I had an immense advantage over many others dealing with the problem inasmuch as I had no fixed ideas derived from long-established practice to control and bias my mind, and did not suffer from the general belief that whatever is, is right. – Henry Bessemer (discovered new method of producing steel)