“Learn to distinguish the difference between errors of knowledge and breaches of morality. An error of knowledge is not a moral flaw, provided you are willing to correct it; only a mystic would judge human beings by the standard of an impossible, automatic omniscience. But a breach of morality is the conscious choice of an action you know to be evil, or a willful evasion of knowledge, a suspension of sight and of thought. That which you do not know, is not a moral charge against you; but that which you refuse to know, is an account of infamy growing in your soul. Make every allowance for errors of knowledge; do not forgive or accept any break of morality.”

“You'll come back, because yours is an error of knowledge, not a moral failure, not an act of surrender to evil, but only the last act of being victim to your own virtue. We'll wait for you and when you come back, you will have discovered that there need never be any conflict among your desires, nor so tragic a clash of values as the one you've borne so well.”

“Political realism refuses to identify the moral aspirations of a particular nation with the moral laws that govern the universe. As it distinguishes between truth and opinion, so it distinguishes between truth and idolatry. All nations are tempted — and few have been able to resist the power for long — to clothe their own aspirations and action in the moral purposes of the universe. To know that nations are subject to the moral law is one thing, while to pretend to know with certainty what is good and evil in the relations among nations is quite another. There is a world of difference between the belief that all nations stand under the judgment of God, inscrutable to the human mind, and the blasphemous conviction that God is always on one's side and that what one wills oneself cannot fail to be willed by God also.The lighthearted equation between a particular nationalism and the counsels of Providence is morally indefensible, for it is that very sin of pride against which the Greek tragedians and the Biblical prophets have warned rulers and ruled. That equation is also politically pernicious, for it is liable to engender the distortion in judgment which, in the blindness of crusading frenzy, destroys nations and civilizations - in the name of moral principle, ideal, or God himself.”

“…let us point out precisely the difficulties of empiricism as a theory of knowledge. First, it begins with two fixed, unchangeable ultimates--mind and matter. Second, it asserts that knowledge is the agreement of ideas with each other, in which case we are not dealing with nature or things at all, and consequently, have left out one of our ultimates. Third, it then asserts (for it is essential that knowledge should somehow or other be connected with things) that knowledge consists in the agreement between an idea and a thing; and in this case we can never tell when the agreement takes place; and furthermore, it is impossible for ideas and things to disagree, for, according to the theory, ideas are copies of things. This means that empiricism can not account for the fact of error. Every theory of knowledge must make a place for error, for, as is evident, error seems to be as industrious as truth.Consequently, if knowledge actually does take place, if there is such an activity, thing, or relation as knowledge, empiricism fails to give an account of it which is free from contradictions. The moral is, as the stories in our school readers say, don't begin with fixed things, for they beguileth one into inconsistencies.”

“Pure practical reason, even with a good knowledge of the facts, will not take you to morality.”

“If the reader thinks he is done, now, and that this book has no moral to it, he is in error. The moral of it is this: If you are of any account, stay at home and make your way by faithful diligence; but if you are "no account," go away from home, and then you will *have* to work, whether you want to or not. Thus you become a blessing to your friends by ceasing to be a nuisance to them - if the people you go among suffer by the operation.”