Karl Popper Quotes

For this, indeed, is the true source of our ignorance-the fact that our knowledge can only be finite, while our ignorance must necessarily be infinite.

Science starts only with problems.

What we should do, I suggest, is to give up the idea of ultimate sources of knowledge, and admit that all knowledge is human; that it is mixed with our errors, our prejudices, our dreams, and our hopes; that all we can do is to grope for truth even though it be beyond our reach.

The belief that we can start with pure observations alone, without anything in the nature of a theory, is absurd.

We may become the makers of our fate when we have ceased to pose as its prophets.