Know thyself. A maxim as pernicious as it is ugly. Whoever studies himself arrest his own development. A caterpillar who seeks to know himself would never become a butterfly.
Self-awareness is not self-centeredness, and spirituality is not narcissism. 'Know thyself' is not a narcissistic pursuit.
One of the perks of being a psychologist is access to tools that allow you to carry out the injunction to know thyself.
'Know thyself' is a good saying, but not in all situations. In many it is better to say 'know others.'
Know thyself? If I knew myself I would run away.