On its own I can think of several things that these words might be uttered in order to express. A little search turns up a more extended form, with a claimed source:
My attitude toward progress has passed from antagonism to boredom. I have long ceased to argue with people who prefer Thursday to Wednesday because it is Thursday.
Said to be by G.K. Chesterton in the New York Times Magazine of February 11, 1923, which appears to be a real thing, but one which is not online. According to this version, he is jibing at progressivism, the adulation of the latest thing because it is newer than yesterday's latest thing.
ETA: Chesterton uses the same analogy, in rather more words, here.
If I advance the thesis that the weather on Monday was better than the weather on Tuesday (and there has not been much to choose between most Mondays and Tuesdays of late), it is no answer to tell me that the time at which I happen to say so is Tuesday evening, or possibly Wednesday morning.
It is vain for the most sanguine meteorologist to wave his arms about and cry: “Monday is past; Mondays will return no more; Tuesday and Wednesday are ours; you cannot put back the clock.” I am perfectly entitled to answer that the changing face of the clock does not alter the recorded facts of the barometer.
It is vain for the most sanguine meteorologist to wave his arms about and cry: “Monday is past; Mondays will return no more; Tuesday and Wednesday are ours; you cannot put back the clock.” I am perfectly entitled to answer that the changing face of the clock does not alter the recorded facts of the barometer.
Note that this accentuates the relevance of a detail that might be skipped over in the original quote- that Thursday comes after Wednesday. That is, this may be intended as a dismissal of the 'all change is progress' position or the 'traditions are bad because they are traditions' position.
Another month has passed and here is a new rationality quotes thread. The usual rules are:
And one new rule: