|The Prodigal Son: Pompeo Batoni|
We would not be able to know which art would make oneself better if we did not know what we ourselves are. But is it perchance easy to know oneself; and was it a good-for-nothing he who put that inscription on the temple of Delphi; or rather is it a matter of something difficult and not within the reach of all? Whether it be easy or not, for us the question is put this way: knowing ourselves we will be able to know how we should take care of ourselves; while, if we ignore the former we shall not at all know the latter.
Plato, Alcibiades 1, 128 E - 129 A