[T]he infliction of cruelty with a good conscience is a delight to moralists. That is why they invented Hell.

I have been accused of a habit of changing my opinions. I am not myself in any degree ashamed of having changed my opinions. What physicist who was already active in 1900 would dream of boasting that his opinions had not changed during the last half century? In science men change their opinions when new knowledge becomes available; but philosophy in the minds of many is assimilated rather to theology than to science. The kind of philosophy that I value and have endeavoured to pursue is scientific, in the sense that there is some definite knowledge to be obtained and that new discoveries can make the admission of former error inevitable to any candid mind. For what I have said, whether early or late, I do not claim the kind of truth which theologians claim for their creeds. I claim only, at best, that the opinion expressed was a sensible one to hold at the time when it was expressed. I should be much surprised if subsequent research did not show that it needed to be modified. I hope, therefore, that whoever uses this dictionary will not suppose the remarks which it quotes to be intended as pontifical pronouncements, but only as the best I could do at the time towards the promotion of clear and accurate thinking. Clarity, above all, has been my aim.

There is darkness without and when I die there will be darkness within. There is no splendor, nor vastness anywhere; only triviality for a moment and then nothing.

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Can a society in which thought and technique are scientific persist for a long period, as, for example, ancient Egypt persisted, or does it necessarily contain within itself forces which must bring either decay or explosion?

One of the commonest things to do with savings is to lend them to some Government. In view of the fact that the bulk of the public expenditure of most civilized Governments consists in payment for past wars or preparation for future wars, the man who lends his money to a Government is in the same position as the bad men in Shakespeare who hire murderers. The net result of the man's economical habits is to increase the armed forces of the State to which he lends his savings. Obviously it would be better if he spent the money, even if he spent it in drink or gambling.

Three passions, simple but overwhelmingly strong have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.

Modern industry depends upon raw materials which are found at, or near, the earth's surface. These raw materials are the product of past geological ages; for the most part they are not being reproduced by any natural process. The elements were built up long ago by a process which we are just beginning to understand, and which when understood may enable clever men to put an end to the human race. The process by which the elements were built up required enormous heat, the sort of heat that exists in the interior of the sun. In a great natural laboratory, nature, starting with hydrogen, arrived by various stages at a number of elements. The number used to be ninety-two but is now indefinite. The elements, at temperatures much lower than that at which they were formed, entered into chemical combinations. At a certain stage the earth was at a temperature peculiarly suitable to the formation of complex chemical combinations, and at last combinations were formed which had the properties that are characteristic of living matter. Living matter has a curious property which I have called "chemical imperialism." In virtue of this property, when it is put into a suitable environment, it transforms a mass of dead matter into a mass of living matter. It is this property which has made organic evolution possible.

When, in youth, I learned what was called "philosophy" ... no one ever mentioned to me the question of "meaning." Later, I became acquainted with Lady Welby's work on the subject, but failed to take it seriously. I imagined that logic could be pursued by taking it for granted that symbols were always, so to speak, transparent, and in no way distorted the objects they were supposed to "mean." Purely logical problems have gradually led me further and further from this point of view. Beginning with the question whether the class of all those classes which are not members of themselves is, or is not, a member of itself; continuing with the problem whether the man who says "I am lying" is lying or speaking the truth; passing through the riddle "is the present King of France bald or not bald, or is the law of excluded middle false?" I have now come to believe that the order of words in time or space is an ineradicable part of much of their significance – in fact, that the reason they can express space-time occurrences is that they are space-time occurrences, so that a logic independent of the accidental nature of spacetime becomes an idle dream. These conclusions are unpleasant to my vanity, but pleasant to my love of philosophical activity: until vitality fails, there is no reason to be wedded to one's past theories. (p. 114)

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.

That is the idea — that we should all be wicked if we did not hold to the Christian religion. It seems to me that the people who have held to it have been for the most part extremely wicked. You find this curious fact, that the more intense has been the religion of any period and the more profound has been the dogmatic belief, the greater has been the cruelty and the worse has been the state of affairs. In the so-called ages of faith, when men really did believe the Christian religion in all its completeness, there was the Inquisition, with all its tortures; there were millions of unfortunate women burned as witches; and there was every kind of cruelty practiced upon all sorts of people in the name of religion.

You find as you look around the world that every single bit of progress in humane feeling, every improvement in the criminal law, every step toward the diminution of war, every step toward better treatment of the colored races, or every mitigation of slavery, every moral progress that there has been in the world, has been consistently opposed by the organized churches of the world. I say quite deliberately that the Christian religion, as organized in its churches, has been and still is the principal enemy of moral progress in the world.

You may think that I am going too far when I say that that is still so. I do not think that I am. Take one fact. You will bear with me if I mention it. It is not a pleasant fact, but the churches compel one to mention facts that are not pleasant. Supposing that in this world that we live in today an inexperienced girl is married to a syphilitic man; in that case the Catholic Church says, 'This is an indissoluble sacrament. You must endure celibacy or stay together. And if you stay together, you must not use birth control to prevent the birth of syphilitic children.' Nobody whose natural sympathies have not been warped by dogma, or whose moral nature was not absolutely dead to all sense of suffering, could maintain that it is

Science seems to be at war with itself.... Naive realism leads to physics, and physics, if true, shows naive realism to be false. Therefore naive realism, if true, is false; therefore it is false.

We do not like to be robbed of an enemy; we want someone to hate when we suffer. It is so depressing to think that we suffer because we are fools; yet, taking mankind in the mass, that is the truth.

When you want to teach children to think, you begin by treating them seriously when they are little, giving them responsibilities, talking to them candidly, providing privacy and solitude for them, and making them readers and thinkers of significant thoughts from the beginning. That’s if you want to teach them to think.