I thought it was Lenin who invented the repeat a lie tactic and Goebbels (an evil genius) who came up with the idea that if you're going to tell a lie, don't tell a little lie. Tell a whopper because people will only chip at the periphery and the crux of the lie will remain.
If you tell a lie big enough and keep repeating it, people will eventually come to believe it. The lie can be maintained only for such time as the State can shield the people from the political, economic and/or military consequences of the lie. It thus becomes vitally important for the State to use all of its powers to repress dissent, for the truth is the mortal enemy of the lie, and thus by extension, the truth is the greatest enemy of the State.
According to wikiquotes, this is "Slightly misquoted, actually denouncing Churchill in "Churchills Lügenfabrik" (i.e. Churchill's lie factory) in "Die Zeit ohne Beispiel" (i.e., A Unique Age)." It does appear that Goebbels was characterizing the British state under Churchill and not advocating the technique for Germany (though of course, they did just that).
Hitler himself used a similar phrase in Mein Kampf:
"the principle— which is quite true in itself — that in the big lie there is always a certain force of credibility; because the broad masses of a nation are always more easily corrupted in the deeper strata of their emotional nature than consciously or voluntarily,"
The nearest I've found to anything by Lenin is this: "A lie told often enough becomes truth"
Can't find any actual citations to any works of Lenin or speeches, despite it being all over the web. It is similar enough to what Goebbels definitely did say, that I'd infer Lenin did not say this, but over time it was just truncated from Goebbels and then falsely attributed to Lenin later. Of course, if an actual documented example from Lenin's works shows up, that would prove the opposite, that Goebbels used Lenin's phrase to describe Churchill.
Geobbels (Global) Warming.