There are times when helpful hints about turning off the gas when not in use are foolish, because the gas has been turned off permanently, or until you can pay the bill. And you don’t care about knowing the trick of keeping bread fresh by putting a cut apple in the box because you don’t have any bread and certainly not an apple, cut or uncut. And there is no point in planning to save the juice from canned vegetables because they, and therefore their juices, do not exist.
— M.F.K. Fisher
taken from The Broad View