The prisoner grows to love his chains.

The measure of a man is what he does with power.

From a short-sided view, the whole moving contents of the heavens seemed to them a parcel of stones, earth and other soul-less bodies, though they furnish the sources of the world order.

... for this discovery of yours will create forgetfulness in the learners' souls, because they will not use their memories; they will trust to the external written characters and not remember of themselves.

Education and admonition commence in the first years of childhood, and last to the very end of life.

I exhort you also to take part in the great combat, which is the combat of life, and greater than every other earthly conflict.

A wise man speaks because he has something to say; a fool because he has to say something.