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.

The fool tells me his reason; the wise man persuades me with my own.

The shape of the heaven is of necessity spherical; for that is the shape most appropriate to its substance and also by nature primary.

The body is at its best between the ages of thirty and thirty-five.

We give up leisure in order that we may have leisure, just as we go to war in order that we may have peace.

Any change of government which has to be introduced should be one which men, starting from their existing constitutions, will be both willing and able to adopt, since there is quite as much trouble in the reformation of an old constitution as in the establishment of a new one, just as to unlearn is as hard as to learn.

In seeking for justice men seek for the mean or neutral, for the law is the mean. Again, customary laws have more weight, and relate to more important matters, than written laws, and a man may be a safer ruler than the written law, but not safer than the customary law.