The Republic by Plato Part 5 Page 63

That is quite true, Socrates; and yet if they are defeated, which may often happen in war, how great the danger is! the children will be lost as well as their parents, and the State will never recover.

True, I said; but would you never allow them to run any risk?

I am far from saying that.

Well, but if they are ever to run a risk should they not do so on some occasion when, if they escape disaster, they will be the better for it?

Clearly.

Whether the future soldiers do or do not see war in the days of their youth is a very important matter, for the sake of which some risk may fairly be incurred.

Yes, very important.

This then must be our first step, —