Was it Goering who said, "If you repeat a lie often enough...?

No, the quote is attributed to various evil men, Stalin among them, and, of the Nazi leaders, to Goebbels. It probably originates, though in different form, from Spinoza, usually not considered an evil man.

In fact, there is evidence that this works even better with implied lies. Just by the way, luckily for us it also works with truths.

Wolfgang