“True freedom is impossible without a mind made free by discipline.”

“Only hidden and undetected oratory is really insidious. What reaches the heart without going through the mind is likely to bounce back and put the mind out of business.”

“A lecture has been well described as the process whereby the notes of the teacher become the notes of the student without passing through the mind of either.”

“The failure in reading -the omnipresent verbalism- of those who have not been trained in the arts of grammar and logic shows how lack of such discipline results in slavery to words rather than mastery of them.”

“To agree without understanding is inane. To disagree without understanding is impudent.”

“... The person who, at any stage of a conversation, disagrees, should at least hope to reach agreement in the end. He should be as much prepared to have his own mind changed as seek to change the mind of another ... No one who looks upon disagreement as an occasion for teaching another should forget that it is also an occasion for being taught.”

“We hope you have not made the error of supposing that to criticize is always to disagree. (...) To agree is just as much of an exercise of critical judgment on your part as to disagree.”