If you tell a big enough lie and tell it frequently enough, it will be believed.

The line is commonly invoked as a warning about propaganda: repetition and scale can overwhelm skepticism, especially when audiences lack reliable counter-information. In that reading, it describes a mechanism by which falsehoods can become socially “true” through constant reinforcement and the psychological pull of consensus. However, attribution matters here: the wording is widely circulated as a Hitler quote, but it is not reliably traceable to a verbatim statement by him in a primary source. What can be said with confidence is that Nazi propaganda theory and practice emphasized repetition, message discipline, and emotional appeal—ideas often condensed into this modern paraphrase.