“A lie repeated a thousand times becomes the truth” is generally considered a famous quote by Paul Joseph Goebbels, the Propaganda Minister of the German Nazi Party. Repetition is a kind of power. Repeat a lie a hundred times and it will become the truth. This is the "Goebbels Effect". Some very important social laws and rules of life are hidden in complex social phenomena. Mastering them will help you discover the truth of things and gain a deeper understanding of society and human nature; using them rationally, many complex and difficult problems will be easily solved. The Goebbels Effect refers to the idea that a lie can become public belief through repetition. Although this quote is very general and influential, there is also a view that Goebbels did not directly say this quote, but was later attributed to him.