Karl Raimund Popper:
(Vienna, 28 July 1902 – London, 17 September 1994).
Austrian-British philosopher widely regarded as one of the greatest philosophers of science of the 20th century.
If you can’t say it simply and clearly, you should keep quiet and keep working until you can say it clearly.
The value of a dialogue depends above all on the diversity of competing opinions.
Our attitude towards the future must be: We are now responsible for what happens in the future.
In the name of tolerance, we should reserve the right not to tolerate intolerance.
We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.
True ignorance is not the absence of knowledge, but the refusal to acquire it.
