Hey look, something else you don't understand about economics. That's not what Keynes meant at all.
Oh no I understand exactly what he means. I just like to poke fun at the fact that his notions of government intervention being the cure-all when it is government policies - specifically monetary policies that cause all these problems in the first place.
I'm assuming that the quote came from the fact that in the early 1920s Great Britain was suffering from gold drains but yet was addicted to cheap credit. Instead of raising interest rates to combat the gold drains they just buddy up with the USA and further expand the monetary base with more inflation in both the USA and GB. His quote is saying that this inflation will not cure itself and needs to be stopped by the central banks. But it was the central banks DOING IT! How can he expect either GB or USA to 180 their views on monetary policy with all the illusions of posterity?
Sometime after this quote and the great depression he completely changes his viewpoint though and adopts inflationary views on how the government should operate, and so, here we are now. Listening to a man (Keynes) who during the inflationary boom of the 1920 was actually advocating putting an end to it, and then once the inflationary boom collapsed, advocates the cure as just more inflation.
Sounds stupid to me, but I guess to others it makes perfect sense?