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.

All men by nature desire knowledge.

The one exclusive sign of thorough knowledge is the power of teaching.

Those who educate children well are more to be honored than they who produce them for these only gave them life, those the art of living well.

The ultimate value of life depends upon awareness and the power of contemplation rather than upon mere survival.