Full Idea
To be unafraid (like a small child who doesn't understand the danger) and to be brave are two quite different things.
Gist of Idea
Being unafraid (perhaps through ignorance) and being brave are two different things
Source
Plato (Laches [c.381 BCE], 197b)
Book Reference
Plato: 'Early Socratic Dialogues', ed/tr. Saunders,Trevor J [Penguin 1987], p.109