Karl Popper Quotes

This false epistemology, however, has also led to disastrous consequences. The theory that truth is manifest — that it is there for everyone to see, if only he wants to see it — this theory is the basis of almost every kind of fanaticism. For only the most depraved wickedness can refuse to see the manifest truth; only those who have reason to fear truth conspire to suppress it.

اگر وسوسه شويم و زبان را سرسري بگيريم، خودِ ما علتِ مشكلاتي خواهيم بود كه پيش مي‌آيد. زيرا زبان خدايي است حسود، كسي را كه با آن سرسري رفتار كند بي‌كيفر نمي‌گذارد، بلكه به اعماقِ تاريكي‌ها و آشفتگي‌ها فرو مي‌برد.

What I criticize under the name Utopian engineering recommends the reconstruction of society as a whole, i.e. very sweeping changes whose practical consequences are hard to calculate, owing to our limited experiences. It claims to plan rationally for the whole of society, although we do not possess anything like the factual knowledge which would be necessary to make good such an ambitious claim.

Great men may make great mistakes;

The quest for precision is analogous to the quest for certainty, and both should be abandoned.

Despite my admiration for scientific knowledge, I am not an adherent of scientism. For scientism dogmatically asserts the authority of scientific knowledge; whereas I do not believe in any authority and have always resisted dogmatism; and I continue to resist it, especially in science. I am opposed to the thesis that the scientist must believe in his theory. As far as I am concerned “I do not believe in belief,” as E. M. Forster says; and I especially do not believe in belief in science. I believe at most that belief has a place in ethics, and even here only in a few instances. I believe, for example, that objective truth is a value — that is, an ethical value, perhaps the greatest value there is — and that cruelty is the greatest evil.

in philosophy methods are unimportant; any method is legitimate if it leads to results capable of being rationally discussed. What matters is not methods or techniques but a sensitivity to problems, and a consuming passion for them; or, as the Greeks said, the gift of wonder.

Learning to read, and to a lesser degree, to write, are of course the major events in one’s intellectual development. There is nothing to compare with it, since very few people (Helen Keller is the great exception) can remember what it meant for them to learn to speak.

a rational analysis of the consequences of a decision does not make the decision rational; the consequences do not determine our decision; it is always we who decide.

Every test of a theory, whether resulting in its corroboration or falsification, must stop at some basic statement or other which we decide to accept. If we do not come to any decision, and do not accept some basic statement or other, then the test will have led nowhere. But considered from a logical point of view, the situation is never such that it compels us to stop at this particular basic statement rather than at that, or else give up the test altogether. For any basic statement can again in its turn be subjected to tests, using as a touchstone any of the basic statements which can be deduced from it with the help of some theory, either the one under test, or another. This procedure has no natural end.

...if God had wanted to put everything into the world from the beginning, He would have created a universe without change, without organisms and evolution, and without man and man's experience of change. But He seems to have thought that a live universe with events unexpected even by Himself would be more interesting than a dead one.

Should you ever intend to dull the wits of a young man and to incapacitate his brains for any kind of thought whatever, then you cannot do better than give him Hegel to read. For these monstrous accumulations of words that annul and contradict one another drive the mind into tormenting itself with vain attempts to think anything whatever in connection with them, until finally it collapses from sheer exhaustion. Thus any ability to think is so thoroughly destroyed that the young man will ultimately mistake empty and hollow verbiage for real thought. A guardian fearing that his ward might become too intelligent for his schemes might prevent this misfortune by innocently suggesting the reading of Hegel.

As indicated by our example, methodological nominalism is nowadays fairly generally accepted in the natural sciences. The problems of the social sciences, on the other hand, are still for the most part treated by essentialist methods. This is, in my opinion, one of the main reasons for their backwardness.

The belief in a political Utopia is especially dangerous. This is possibly connected with the fact that the search for a better world, like the investigation of our environment, is (if I am correct) one of the oldest and most important of all the instincts.

It is interesting that for Plato, and for most Platonists, an altruistic individualism cannot exist. According to Plato, the only alternative to collectivism is egoism; he simply identifies all altruism with collectivism, and all individualism with egoism. This is not a matter of terminology, of mere words, for instead of four possibilities, Plato recognized only two. This has created considerable confusion in speculation on ehtical matters, even down to our own day.

Plato’s identification of individualism with egoism furnishes him with a powerful weapon for his defence of collectivism as well as for his attack upon individualism. In defending collectivism, he can appeal to our humanitarian feeling of unselfishness; in his attack, he can brand all individualists as selfish, as incapable of devotion to anything but themselves. This attack, although aimed by Plato against individualism in our sense, i.e. against the rights of human individuals, reaches of course only a very different target, egoism. But this difference is constantly ignored by Plato and by most Platonists...

Individualism was part of the old intuitive idea of justice. That justice is not, as Plato would have it, the health and harmony of the state, but rather a certain way of treating individuals, is emphasized by Aristotle, when he says, ‘justice is something that pertains to persons.