Cicero

The function of wisdom is to discriminate between good and evil.

All action is of the mind and the mirror of the mind is the face, its index the eyes

All literature, all philosophical treatises, all the voices of antiquity are full of examples for imitation, which would all lie unseen in darkness without the light of literature.
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Gratitude is not only the greatest of virtues, but the parent of all others.  

He who has a garden and a library wants for nothing.

Ability without honor is useless.

A man has no enemy worse than himself.

Advice in old age is foolish; for what can be more absurd than to increase our provisions for the road the nearer we approach to our journey's end.

Every stage of human life, except the last, is marked out by certain and defined limits; old age alone has no precise and determinate boundary.

The foolishness of old age does not characterize all who are old, but only the foolish.