“Every for Ever. ‘Every now and then.’ This is nonsense: there can be no such thing as a now and then, nor, of course, a number of now and thens. Now and then is itself bad enough, reversing as it does the sequence of things, but it is idiomatic and there is no quarreling with it. But ‘every’ is here a corruption of ever, meaning repeatedly, continually.”
Excerpted from: Bierce, Ambrose. Write it Right: A Little Blacklist of Literary Faults. Mineola, NY: Dover, 2010.