It has long been clear that the federal debt limit is far too dangerous and unstable for lawmakers to use as a political weapon. Allowing that to happen in the last few traumatic weeks created an artificial national crisis that put the economy and the savings of Americans at risk and helped produce a loss of confidence that lingered as a cause of Thursday’s stock-market plunge.

None of that, however, has stopped Republican leaders, who announced this week that they intend to repeat this explosive episode over and over, in perpetuity. With the bad memory still fresh, President Obama should quickly seize the opportunity to make clear that he will not allow it even once more, never mind permanently. Instead of raising the debt ceiling every few years, it’s time to eliminate this dangerous game once and for all.

As this page said in 1961 — not remotely for the first time or the last — the “debt limit does not limit the debt.” It’s an illusion of a law, instituted in World War I, to persuade gullible taxpayers that Congress is exercising responsible oversight over borrowing. Congress already controls spending and taxation, and if it wants a smaller debt it can cut spending or raise taxes at will. To allow the deficit to rise, and then refuse to pay for it months later, is the definition of financial irresponsibility.

But being irresponsible worked for Republicans this time. They refused to raise the limit without cuts in spending and won $2.5 trillion in cuts in the deal wrapped up on Tuesday. Now they want to make permanent the arbitrary and simplistic standard devised by Speaker John Boehner — a dollar of cuts for every dollar in the debt increase.