The Republic by Plato Part 6 Page 5

are lovers of all true being; there is no part whether greater or less, or more or less honourable, which they are willing to renounce; as we said before of the lover and the man of ambition.

True.

And if they are to be what we were describing, is there not another quality which they should also possess?

What quality?

Truthfulness: they will never intentionally receive into their mind falsehood, which is their detestation, and they will love the truth.

Yes, that may be safely affirmed of them.

‘May be,’ my friend, I replied, is not the word; say rather ‘must be affirmed:’ for he whose nature is amorous of anything cannot help