Necessity, who is the mother of our invention.

There still remain three studies suitable for free man. Arithmetic is one of them.

The well-nurtured youth is one who would see most clearly whatever was amiss in ill-made works of man or ill-grown works of nature, and with a just distaste would blame and hate the ugly even from his earliest years and would give delighted praise to beauty, receiving it into his soul and being nourished by it, so that he became a man of gentle heart.

In order to be a good soldier it is necessary to know how to dance.

I would fain grow old learning many things.

Man is the plumeless genus of bipeds, birds are the plumed.

And we shall most likely be defeated, and you will most likely be victors in the contest, if you learn so to order your lives as not to abuse or waste the reputation of your ancestors, knowing that to a man who has any self-respect, nothing is more dishonourable than to be honoured, not for his own sake, but on account of the reputation of his ancestors.