Sorry for what?
Apologise for what? That is the question that Gordon Brown asks every time someone suggests that he ought to say sorry.
It is the right question to ask. Just think back to the bankers facing the select committee. When the word "sorry" is said insincerely, or when it means only sympathy to those who suffered - when it is not an apology for mistakes made - it has little value, or none at all.
Today, the shadow chancellor George Osborne has delivered a speech suggesting what Gordon Brown ought to say sorry for. It is, argues Osborne, an economy built on debt: personal debt (in the form of mortgages that people couldn't afford); corporate debt (in the sense that companies were built on borrowing rather than on equity investment) and public debt (in the form of excessive public spending and borrowing).
What's more, he argues, the regulatory system has failed, with the Bank of England setting an inflation target that ignored the housing bubble, and the so-called tripartite regulating system failing to keep control of the banks, let alone what we must now get used to calling "the shadow banks": the hedge funds and other financial institutions.
Recently, ministers have been suggesting that they regret not being tough enough on the banks. Ed Balls has said it; Peter Mandelson has too, and so has Alistair Darling.
In this curious public debate between ministers about whether to say sorry and what to say sorry for, Gordon Brown seems to be answering his ministerial colleagues by insisting that national regulation alone could not have prevented the current crisis.
After all, RBS bought a Dutch bank that had been cleared by the Dutch authorities. That's why, at the G20, he will argue in favour of a council of regulators - of co-operation between regulators but not a single global regulator. The problem one instinctively sees is: if individual national regulators failed, why should they succeed when they are merely linked up?
This debate about what to apologise for, if anything, goes to the heart of learning the lessons from the crisis that we are now facing.
This is what matters - not some media storm over whether saying the word "sorry" would transform Labour's polling position or not.