The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know; our knowledge of our ignorance. For this indeed, is the main source of our ignorance - the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.

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About Karl Popper

Sir Karl Raimund Popper (28 July 1902 – 17 September 1994) was an Austrian-British philosopher, academic and social commentator. One of the 20th century's most influential philosophers of science, Popper is known for his rejection of the classical inductivist views on the scientific method in favour of empirical falsification. According to Popper, a theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can (and should) be scrutinised with decisive experiments. Popper was opposed to the classical justificationist account of knowledge, which he replaced with critical rationalism, namely "the first non-justificational philosophy of criticism in the history of philosophy".

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Additional quotes by Karl Popper

The difference between Plato’s theory on the one hand, and that of the Old Oligarch and the Thirty on the other, is due to the influence of the Great Generation. Individualism, equalitarianism, faith in reason and love of freedom were new, powerful, and, from the point of view of the enemies of the open society, dangerous sentiments that had to be fought. Plato had himself felt their influence, and, within himself, he had fought them. His answer to the Great Generation was a truly great effort. It was an effort to close the door which had been opened, and to arrest society by casting upon it the spell of an alluring philosophy, unequalled in depth and richness. In the political field he added but little to the old oligarchic programme against which Pericles had once argued64. But he discovered, perhaps unconsciously, the great secret of the revolt against freedom, formulated in our own day by Pareto65; ‘To take advantage of sentiments, not wasting one’s energies in futile efforts to destroy them.’ Instead of showing his hostility to reason, he charmed all intellectuals with his brilliance, flattering and thrilling them by his demand that the learned should rule. Although arguing against justice he convinced all righteous men that he was its advocate. Not even to himself did he fully admit that he was combating the freedom of thought for which Socrates had died; and by making Socrates his champion he persuaded all others that he was fighting for it. Plato thus became, unconsciously, the pioneer of the many propagandists who, often in good faith, developed the technique of appealing to moral, humanitarian sentiments, for anti-humanitarian, immoral purposes. And he achieved the somewhat surprising effect of convincing even great humanitarians of the immorality and selfishness of their creed66. I do not doubt that he succeeded in persuading himself. He transfigured his hatred of individual initiative, and his wish to arrest all change, into a love of justice and tempera

It is under the influence of such romantic ideas that individualism is still identified with egoism, as it was by Plato, and altruism with collectivism (i.e. with the substitution of group egoism for the individualist egoism). But this bars the way even to a clear formulation of the main problem, the problem of how to obtain a sane appreciation of one’s own importance in relation to other individuals. Since it is felt, and rightly so, that we have to aim at something beyond our own selves, something to which we can devote ourselves, and for which we may make sacrifices, it is concluded that this must be the collective, with its ‘historical mission’. Thus we are told to make sacrifices, and, at the same time, assured that we shall make an excellent bargain by doing so. We shall make sacrifices, it is said, but we shall thereby obtain honour and fame. We shall become ‘leading actors’, heroes on the Stage of History; for a small risk we shall gain great rewards. This is the dubious morality of a period in which only a tiny minority counted, and in which nobody cared for the common people. It is the morality of those who, being political or intellectual aristocrats, have a chance of getting into the textbooks of history. It cannot possibly be the morality of those who favour justice and equalitarianism; for historical fame cannot be just, and it can be attained only by a very few. The countless number of men who are just as worthy, or worthier, will always be forgotten.