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.

Observation is always selective. It needs a chosen object, a definite task, an interest, a point of view, a problem.

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