"Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant."
"The digestive canal is in its task a complete chemical factory. The raw material passes through a long series of institutions in which it is subjected to certain mechanical and, mainly, chemical processing, and then, through innumerable side-streets, it is brought into the depot of the body. Aside from this basic series of institutions, along which the raw material moves, there is a series of lateral chemical manufactories, which prepare certain reagents for the appropriate processing of the raw material."
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Source: Ivan Petrovich Pavlov (1957). “Experimental psychology, and other essays”
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