Oratory is good only if it has the qualities of fitness for the occasion, propriety of style, and originality of treatment, while in the case of letters there is no such need whatsoever.
IsocratesAlways when you are about to say anything, first weigh it in your mind; for with many the tongue outruns the thought.
IsocratesThose who directed the state in the time of Solon and Cleisthenes did not establish a polity which ... trained the citizens in such fashion that they looked upon insolence as democracy, lawlessness as liberty, impudence of speech as equality, and licence to do what they pleased as happiness, but rather a polity which detested and punished such men and by so doing made all the citizens better and wiser.
IsocratesIt is not fitting that the evil produced by men should be imputed to things; let those bear the blame who make an ill use of things in themselves good.
IsocratesSo far has Athens left the rest of mankind behind in thought and expression that her pupils have become the teachers of the world, and she has made the name of Hellas distinctive no longer of race but of intellect, and the title of Hellene a badge of education rather than of common descent.
Isocrates