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.
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.