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He knows nothing and thinks he knows everything. That points clearly to a political career.

One who is too insistent on his own views, finds few to agree with him.

He who has a task to perform must know how to take sides, or he is quite unworthy of it.

He who knows only his own side of the case knows little of that.

He who closes his ears to the views of others shows little confidence in the integrity of his own views.

He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors.

He that knows himself, knows others; and he that is ignorant of himself, could not write a very profound lecture on other men's heads.

What a man knows is everywhere at war with what he wants.

He who believes in nobody knows that he himself is not to be trusted.

The utmost extent of man's knowledge, is to know that he knows nothing.