Aristotle

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

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

Dignity does not consist in possessing honors, but in deserving them.

Bashfulness is an ornament to youth, but a reproach to old age.

We are not angry with people we fear or respect, as long as we fear or respect them; you cannot be afraid of a person and also at the same time angry with him.

For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.

We praise a man who feels angry on the right grounds and against the right persons and also in the right manner at the right moment and for the right length of time.

It is not once nor twice but times without number that the same ideas make their appearance in the world.

Pleasure in the job puts perfection in the work.

Personal beauty is a greater recommendation than any letter of reference.