It is just that we should be grateful, not only to those with whose views we may agree, but also to those who have expressed more superficial views; for these also contributed something, by developing before us the powers of thought – Aristotle

You will never do anything in this world without courage. It is the greatest quality of the mind next to honor – Aristotle

Those that know, do. Those that understand, teach – Aristotle

The one exclusive sign of thorough knowledge is the power of teaching – Aristotle

All paid jobs absorb and degrade the mind – Aristotle

The roots of education are bitter, but the fruit is sweet – Aristotle