Only two kinds of people can attain self-knowledge: those who are not encumbered at all with learning, that is to say, whose minds are not over-crowded with thoughts borrowed from others; and those who, after studying all the scriptures and sciences, have come to realise that they know nothing.
of being strong and brave. The strong can not be brave. Only the weak can be brave; and yet again, in practice, only those who can be brave can be trusted, in time of doubt, to be strong.