We hate the very idea that our own ideas may be mistaken, so we cling dogmatically to our conjectures.
Karl PopperThe survival value of intelligence is that it allows us to extinct a bad idea, before the idea extincts us.
Karl PopperThe scientific tradition is distinguished from the pre-scientific tradition by having two layers. Like the latter, it passes on its theories; but it also passes on a critical attitude towards them.
Karl PopperIt is wrong and dangerous to extol freedom by telling people that they will certainly be all right once they are free. The most we can say of democracy or freedom is that they give our personal abilities a little more influence on our well-being.
Karl Popper