“A person who knows but a little will put on an air of knowledge. This is a matter of inexperience. When someone knows something well, it will not be seen in his manner.”
Hagakure (c. 1716)
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Tsunetomo Yamamoto 65
Samurai 1659–1719Related quotes

“The person who knows only his side of the argument knows little of that.”

Why I Am An Agnostic (1929)

“You really only know when you know little. Doubt grows with knowledge.”
Maxim 281, trans. Stopp
Variant translation: Only when we know little do we know anything. Doubt grows with knowledge.
Maxims and Reflections (1833)

A Course of Lectures on Oratory and Criticism (1777), Part III, Lecture XVI, p. 116