Isocrates

“Do not do to others what would anger you if done to you by others.”

“Always be making useful friends.”

“Spend your leisure time in cultivating an ear attentive to discourse, for in this way you will find that you learn with ease what others have found out with difficulty.”

“Eloquence is the power to translate a truth into language perfectly intelligible to the person to whom you speak.”

“Guard yourself against accusations, even if they are false; for the multitude are ignorant of the truth and look only to reputation.”

“Be gracious to all men, but choose the best to be your friends.”

“The root of education is bitter, but the fruit is sweet.”

“Of all our possessions, wisdom alone is immortal.”

“The power to speak well is taken as the surest index of a sound understanding.”

“Regard as your most faithful friends, not those who praise everything you say or do, but those who criticize your mistakes.”

“If you be a lover of instruction, you will be well instructed.”

“It is not possible for those who are wicked to be like-minded with those who are good.”

“The noblest of all studies is the study of what man is and of what life he should live.”

“Whetstones are not themselves able to cut, but make iron sharp.”

“It is more important to know where you are going than to get there quickly.”