In 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

The Logic of Scientific Discovery

Authentication Score 3

Original Citation

Popper, Karl. Logik der Forschung [The Logic of Research]. Julius Springer, 1934, pt. 1, ch. 1.

Current Citation

Popper, Karl. The Logic of Scientific Discovery. Routledge, 2002, pt. 1, ch. 1.