How we cite our quotes: Stephanus pagination (the standardized way in which every text of Plato is divided). Every edition and translation will have this pagination in the margins.
Quote #1
"When and for whom is [a lie]... useful? Isn't it useful against enemies, and, as a preventative, like a drug, for so-called friends when from madness or some folly they attempt to do something bad?" (382c)
Here's the first defense of lying. A lie is useful if it prevents bad things from happening. Are you convinced? Who determines what is bad for people? Can you think of situations where a lie might be useful in this way?
Quote #2
"Could we... somehow contrive one of those lies that come into being in case of need... some one noble lie to persuade, in the best case, even the rulers, but if not them, the rest of the city?" (414c)
Socrates refers to his idea of the "noble lie"—you know, a lie that's okay—and asks the gang to come up with an example so they can all understand this slippery concept.
Quote #3
"...I'm afraid that in slipping from truth where one least ought to slip, I'll not only fall myself but also drag my friends down with me" (451a)
Socrates is hesitant at first to embark on the great quest for truth that is the Republic because he doesn't want to mislead anyone, especially about stuff that's super important.