Just because an idea is true doesn't mean it can be proved. And just because an idea can be proved doesn't mean it's true.

Study, along the lines which the theologies have mapped, will never lead us to discovery of the fundamental facts of our existence. That goal must be attained by means of exact science and can only be achieved by such means. The fact that man, for ages, has superstitiously believed in what he calls a God does not prove at all that his theory has been right. There have been many gods – all makeshifts, born of inability to fathom the deep fundamental truth. There must be something at the bottom of existence, and man, in ignorance, being unable to discover what it is through reason, because his reason has been so imperfect, undeveloped, has used, instead, imagination, and created figments, of one kind or another, which, according to the country he was born in, the suggestions of his environment, satisfied him for the time being. Not one of all the gods of all the various theologies has ever really been proved. We accept no ordinary scientific fact without the final proof; why should we, then, be satisfied in this most mighty of all matters, with a mere theory?

Destruction of false theories will not decrease the sum of human happiness in future, any more than it has in the past... The days of miracles have passed. I do not believe, of course, that there was ever any day of actual miracles. I cannot understand that there were ever any miracles at all. My guide must be my reason, and at thought of miracles my reason is rebellious. Personally, I do not believe that Christ laid claim to doing miracles, or asserted that he had miraculous power...

Our intelligence is the aggregate intelligence of the cells which make us up. There is no soul, distinct from mind, and what we speak of as the mind is just the aggregate intelligence of cells. It is fallacious to declare that we have souls apart from animal intelligence, apart from brains. It is the brain that keeps us going. There is nothing beyond that.

Life goes on endlessly, but no more in human beings than in other animals,

Religious doctrines … are all illusions, they do not admit of proof, and no one can be compelled to consider them as true or to believe in them.

Two things are to be remembered: that a man whose opinions and theories are worth studying may be presumed to have had some intelligence, but that no man is likely to have arrived at complete and final truth on any subject whatever. When an intelligent man expresses a view which seems to us obviously absurd, we should not attempt to prove that it is somehow true, but we should try to understand how it ever came toseemtrue. Thisexercise of historical and psychological imagination at once enlarges the scope of our thinking, and helps us to realize how foolish many of our own cherished prejudices will seem to an age which has a different temper of mind.

Why do you keep maintaining your ideas are right if you can't prove them?

[...] we can find no true or existent fact, no true assertion, without there being a sufficient reason why it is thus and not otherwise, although most of the time these reasons cannot be known to us.

There are some ideas so absurd that only an intellectual could believe them.

I mean, you could claim that <i>anything's</i> real if the only basis for believing in it is that nobody's <i>proved</i> it doesn't exist!

What is real and what is not? Can you tell me or I you? Perhaps we shall never know more than this — that to think a thing is to make it true.

Finding ourselves in a universe that seems bent on destroying us, we quickly discover, both as individuals and as societies, that it is a good thing to understand the forces arrayed against us. And so it is that every human being comes to desire genuine knowledge about the world. This has always posed a special problem for religion, because every religion preaches the truth of propositions for which it has no evidence. In facet, every religion preaches the truth of propositions for which no evidence is even conceivable.

It is now generally admitted, at any rate by philosophers, that the existence of a being having the attributes which define the god of any non-animistic religion cannot be demonstratively proved... [A]ll utterances about the nature of God are nonsensical.

I am beginning to believe that nothing can ever be proved. These are honest hypotheses which take the facts into account: but I sense so definitely that they come from me, and that they are simply a way of unifying my own knowledge. Not a glimmer comes from Rollebon's side. Slow, lazy, sulky, the facts adapt themselves to the rigour of the order I wish to give them; but it remains outside of them. I have the feeling of doing a work of pure imagination.

The majority of men prefer delusion to truth. It soothes. It is easy to grasp. Above all, it fits more snugly than the truth into a universe of false appearances — of complex and irrational phenomena, defectively grasped. But though an idea that is true is thus not likely to prevail, an idea that is attacked enjoys a great advantage. The evidence behind it is now supported by sympathy, the sporting instinct, sentimentality — and sentimentality is as powerful as an army with banners. One never hears of a martyr in history whose notions are seriously disputed today. The forgotten ideas are those of the men who put them forward soberly and quietly, hoping fatuously that they would conquer by the force of their truth; these are the ideas that we now struggle to rediscover.

The things we believe carry a charge regardless of whether they can be proven or not.