In short, neither quickness of learning nor a good memory can make a man see when his nature is not akin to the object, for this knowledge never takes root in an alien nature; so that no man who is not naturally inclined and akin to justice and all other forms of excellence, even though he may be quick at learning and remembering this and that and other things, nor any man who, though akin to justice, is slow at learning and forgetful, will ever attain the truth that is attainable about virtue.