It is part of my thesis that all our knowledge grows only through the correcting of our mistakes.
Karl PopperIn so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about reality.
Karl Popper. . . it seems to me certain that more people are killed out of righteous stupidity than out of wickedness.
Karl PopperOptimism is a duty. The future is open. It is not predetermined. No one can predict it, except by chance. We all contribute to determining it by what we do. We are all equally responsible for its success.
Karl Popper