Quotes from Plato, The Republic

Necessity, who is the mother of invention.

The punishment which the wise suffer who refuse to take part in the government is to live under the government of worse men.

There are three arts which are concerned with all things: one which uses, another which makes, and a third which imitates them.

Money-makers are tiresome company, as they have no standard but cash value.

The philosopher whose dealings are with divine order himself acquires the characteristics of order and divinity.

The worst type of man behaves as badly in his waking life as some men do in their dreams.

But I don't think we shall quarrel about a word - the subject of our inquiry is too important for that.

Justice is useful when money is useless.

The heaviest penalty for declining to rule is to be ruled by someone inferior to yourself.

It is only just that anything that grows up on its own should feel it has nothing to repay for an upbringing which it owes no one.

Either we shall find what it is we are seeking or at least we shall free ourselves from the persuasion that we know what we do not know.

Haven't you noticed that opinion without knowledge is always a poor thing? At the best it is blind—isn't anyone who holds a true opinion without understanding like a blind man on the right road?

Those who don't know must learn from those who do.

The tools that would teach men their own use would be beyond price.

You take the words in the sense which is most damaging to the argument.