“If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking as you do.”

“The Ten Commandments that, as a teacher, I should wish to promulgate, might be set forth as follows:1- Do not feel absolutely certain of anything.2- Do not think it worth while to proceed by concealing evidence, for the evidence is sure to come to light.3- Never try to discourage thinking for you are sure to succeed.4- When you meet with opposition, even if it should be from your husband or your children, endeavor to overcome it by argument and not by authority, for a victory dependent upon authority is unreal and illusory.5- Have no respect for the authority of others, for there are always contrary authorities to be found.6- Do not use power to suppress opinions you think pernicious, for if you do the opinions will suppress you.7- Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.8- Find more pleasure in intelligent dissent than in passive agreement, for, if you value intelligence as you should, the former implies a deeper agreement than the latter.9- Be scrupulously truthful, even if the truth is inconvenient, for it is more inconvenient when you try to conceal it.10- Do not feel envious of the happiness of those who live in a fool’s paradise, for only a fool will think that it is happiness.”

“Whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants.”

“Everything is vague to a degree you do not realize till you have tried to make it precise.”

“Your writing is never as good as you hoped; but never as bad as you feared.”

“The skill of the politician consists in guessing what people can be brought to think advantageous to themselves; the skill of the experts consists in calculating what really is advantageous, provided people can be brought to think so. (The proviso is essential, because measures which arouse serious resentment are seldom advantageous, whatever merits they may have otherwise.) The power of the politician, in a democracy, depends upon his adopting the opinions which seem right to the average man. It is useless to urge that politicians ought to be high-minded enough to advocate what enlightened opinion considers good, because if they do they are swept aside for others.”

“The root of the matter is a very simple and old fashioned thing... love or compassion. If you feel this, you have a motive for existence, a guide for action, a reason for courage, an imperative necessity for intellectual honesty.”