“The unexamined life is not worth living.”

 ὁ ... ἀνεξέταστος βίος οὐ βιωτὸς ἀνθρώπῳ
To examine one’s life one has to be informed.
To be informed one has to take trouble.
To take trouble one has to take life seriously.
To take life seriously one has definitely not to take oneself seriously.
Our civilisation is horribly crammed with people who take themselves seriously.