Reversing a proposition rearranges its terms, but still keeps out new terms.
When science drove the gods out of nature, they took refuge in poetry and the porticos of civic buildings.
Stated clearly enough, an idea may cancel itself out.
Alzheimer's usually comes later than AIDS, but I decline to call that progress.
History takes place between the Fall and the Apocalypse, with a narrow escape route called Salvation.
Errors are more numerous than truths, but fortunately too divided among themselves to take power.