Karl Popper
Citas
“Ultimately, in this way, rationalism is linked up with the recognition of the necessity of social institutions to protect freedom of criticism, freedom of thought, and thus the freedom of men. And it estrablishes something like a moral obligation towards the support of these institutions. This is why rationalism is closely linked up with the political demand for practical social engineering - piecemeal engineering, of course - in the humanitarian sense, with the demand for the rationalization of society, for planning for freedom, and for its control by reason; not by 'science', not by a Platonic, a pseudo-rational authority, but by that Socratic reason which is aware of its limitations, and which therefore respects the other man and does not aspire to coerce him - not even into happiness.” (The open society and Its enemies)
“We can interpret the history of power politics from the point of view of our fight for the open society, for a rule of reason, for justice, freedom, equality, and for the control of international crime. Although history has no ends, we can impose these ends of ours upon it; and although history has no meaning, we can give it a meaning.” (The open society and Its enemies)
“Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them… We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.” (The open society and Its enemies)