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A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

In experimental philosophy, we are to look upon propositions inferred by general induction from phenomena as accurately or very nearly true, notwithstanding any contrary hypotheses that may be imagined, till such time as other phenomena occur by which they may either be made more accurate or liable to exceptions.

It is a test of true theories not only to account for but to predict phenomena.

The true method of knowledge is experiment.

There can be theory but, you know, the problem is you've got to be able to test it. So theories are one thing, testing is another.

Truth in science is always determined from observational facts.

A valid scientific theory is predictive, verifiable, and replicable. To me, that's beautiful.

In so far as such a theory is empirically correct it will also tell us what empirical facts it should be possible to observe in a given set of circumstances.

The strongest arguments prove nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences and the goal of all speculation.

Everything is an experiment.