‘A wise man knows he knows nothing’ but if he knows nothing how does he know. Some more proverbial paradoxes:

The pen is mightier than the sword

but

Actions speak louder than words

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Faith will move mountains

but

Doubt is the beginning of wisdom

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Clothes make the man

but

Never judge a book by its cover

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All good things come to those who wait

but

Time waits for no man

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Birds of a feather flock together

but

Opposites attract

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Fools rush in where angels fear to tread

but

He who hesitates is lost

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Wise men think alike

but

Fools seldom differ