Chancellor George Osborne's clear message today is revolutionary: a surplus in good times as an insurance against bad times.
In 25 years of covering politics, I have never heard a senior politician make an out-and-out commitment to running budget surpluses.
He is intending to fight the next election squarely on the public finances.
The Chancellor set out a tough new policy which will require future Tory governments to run an absolute surplus during periods of growth.
The costs will determine just how enthusiastic lenders are about jumping into the government's new scheme.
'Help to Work' sounds innocuous enough but it is a major gear change in the government's attempt to curb welfare costs.