Socrates had no system to teach. Throughout, his philosophy was a spiritual exercise, an invitation to a new way of life, active reflection, and living consciousness. 

To know oneself means, among other things, to know oneself qua non-sage: that is, not as a sophos, but as a philo-sophos, someone on the way toward wisdom.

Pierre Hadot (1922 CE-2010 CE), Pierre Hadot was a French philosopher and historian of philosophy specialising in ancient philosophy, particularly Neoplatonism.