Full Idea
It is goodness which gives the things we know their truth and makes it possible for people to have knowledge.
Gist of Idea
Goodness makes truth and knowledge possible
Source
Plato (The Republic [c.371 BCE], 508e)
Book Reference
Plato: 'Republic', ed/tr. Waterfield,Robin [OUP 1993], p.236
A Reaction
If we take truth to be the hallmark of successful thinking, then I have no idea what this means. I can't see how truth would disappear in an amoral cosmos.