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

Jealousy is both reasonable and belongs to reasonable men, while envy is base and belongs to the base, for the one makes himself get good things by jealousy, while the other does not allow his neighbour to have them through envy – Aristotle

He who hath many friends hath none – Aristotle

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

The ideal man bears the accidents of life with dignity and grace, making the best of circumstances – Aristotle

In making a speech one must study three points: first, the means of producing persuasion; second, the language; third the proper arrangement of the various parts of the speech – Aristotle