All soul is immortal. For that which is always in movement is immortal; that which moves something else, and is moved by something else, in ceasing from movement ceases from living. So only that which moves itself, because it does not abandon itself, never stops moving. But it is also source and first principle of movement for the other things which move.
PlatoAnd among the other honours and rewards our young men can win for distinguished service in war and in other activities, will be more frequent opportunities to sleep with a woman; this will give us a pretext for ensuring that most of our children are born of that parent.
PlatoWhen two friends are in the mood to chat, we have to go about it in a gentler and more dialectical way. By 'more dialectical,' I mean not only that we give real responses, but that we base our responses solely on what the interlocutor admits that he himself knows.
Plato