Propose theories which can be criticized. Think about possible decisive falsifying experiments-crucial experiments. But do not give up your theories too easily-not, at any rate, before you have critically examined your criticism.
Interpretation
This quote emphasizes the importance of proposing theories that can be tested and criticized while also advocating for resilience in the face of criticism.
Karl Popper urges thinkers to put forth theories that are open to scrutiny and capable of being disproven through decisive experiments. He highlights a critical approach to scientific discourse, encouraging individuals not to abandon their theories at the first sign of criticism but to thoroughly analyze and engage with those critiques before making any conclusions.
In practice
In a scientific conference discussing new research findings.
The growth of our knowledge is the result of a process closely resembling what Darwin called 'natural selection'; that is, the natural selection of hypotheses: our knowledge consists, at every moment, of those hypotheses which have shown their (comparative) fitness by surviving so far in their struggle for existence, a competitive struggle which eliminates those hypotheses which are unfit.
If you can't say it simply and clearly, keep quiet, and keep working on it till you can.
No particular theory may ever be regarded as absolutely certain.... No scientific theory is sacrosanct.
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.
A rationalist is simply someone for whom it is more important to learn than to be proved right; someone who is willing to learn from others - not by simply taking over another's opinions, but by gladly allowing others to criticize his ideas and by gladly criticizing the ideas of others
Thus science must begin with myths, and with the criticism of myths; neither with the collection of observations, nor with the invention of experiments, but with the critical discussion of myths, and of magical techniques and practices.
Like any place in Reality, the Street is subject to development. Developers can build their own small streets feeding off of the main one. They can build buildings, parks, signs, as well as things that do not exist in Reality, such as vast hovering overhead light shows and special neighborhoods where the rules of three-dimensional spacetime are ignored.
Great is the guilt of an unnecessary war.
Among the basic freedoms to which men aspire that their lives might be full and uncramped, freedom from fear stands out as both a means and an end. A people who would build a nation in which strong, democratic institutions are firmly established as a guarantee against state-induced power must first learn to liberate their own minds from apathy and fear.
Our senses enable us to perceive only a minute portion of the outside world. Our hearing extends to a small distance. Our sight is impeded by intervening bodies and shadows. To know each other we must reach beyond the sphere of our sense perceptions. We must transmit our intelligence, travel, transport the materials and transfer the energies necessary for our existence.
The liberal ideal is that everyone should have fair access and fair opportunity. This is not equality fo result. Its equality of opportunity. There's a fundamental difference.
It is our very search, our lust for the miraculous and magical, that hides from us the truth that simply to be, simply to know I am, is already the miracle that we seek. Everything, as it is, is perfect, but you must stop seeing it as if in a mirror, as if in a dream.
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