"There is only one good, knowledge, and one evil, ignorance."

"The only good is knowledge, and the only evil is ignorance."

"For I do believe that I have been sent by God to the city as a gadfly to a great and noble horse which is rather sluggish because of its size and needs to be stirred up by a gadfly."

"No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable."

"I examined the poets, and I look on them as people whose talent overawes both themselves and others, people who present themselves as wise men and are taken as such, when they are nothing of the sort."