Demosthenes overcame and rendered more distinct his inarticulate and stammering pronunciation by speaking with pebbles in his mouth. Plutarch
To make no mistakes is not in the power of man; but from their errors and mistakes the wise and good learn wisdom for the future. See image Plutarch
I don't need a friend who changes when I change and who nods when I nod; my shadow does that much better. See image Plutarch