A law of nature is unalterable; there are no exceptions to it. For if we are satisfied that something has happened which contradicts it, then we do not say that there is an exception, or an alteration to the law, but rather that our hypothesis has been refuted, since it has turned out that the supposed strict regularity did not hold, or in other words, that the supposed law of nature was not a true law of nature, but a false statement. Since laws of nature are unalterable, they can be neither broken nor enforced.
