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

Pleasure in the job puts perfection in the work – Aristotle

A true friend is one soul in two bodies – Aristotle

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

Moral excellence comes about as a result of habit. We become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts – Aristotle