Alas, he was wrong from the outset, so as that fact did not change, neither did he change is mind.
He also said "In the long run we are all dead", which might give us a hint at why he was happy to mortgage the future.
Keynes is so utterly wrong, yet now at the very point when we should reject his dysfunctional, bankrupt ideology the more, Gordon Brown and Darling are embracing him.
Today's borrowing is taxation...with interest. Borrowing today reduces the spending power of every pound in every pocket, so it is an insidious, indirect and unavoidable taxation upon us all. It is taxation for the future, too, as that debt plus interest needs to be repaid. As WSC said, taxing your way to prosperity is like a man standing in a bucket trying to lift himself up by the handle.
The only possible reason I can see for all this is that the Government wishes to conduct a scorched earth policy so that the next Tory government will be a short one. Ladder-kickers, the lot of 'em.
If you want to stimulate the economy, make it run faster, reduce the friction. Reduce government spending.
It is an absurd notion to think that by taking money away from individuals, handing it to a bunch of the Government's pet friends, mainly in the construction industry, to then spend and employ people, that somehow those people employed and suppliers supplied will magically create demand across all the economy. How about just not doing anything so that everyone keeps their money and can spend it directly in the first place? How about REDUCING taxation so people feel more confident, can pay off their loans and then resume spending? Oh no, that alternative does not require the State to be involved. Its mates cannot get largesse. It is then not the arbiter, the director of resources. It will not be able to delude itself that it knows best.