Well, the thing is that there is no connection between the actual quote and Goebbels himself saying that no matter how much fitting that would be. The only thing a bit similar I found from a tiny search was from one of his speeches here that he is saying “I have made the truth speak for itself, because truth is the strongest ally in the struggle for a new idea. I have nothing to hide and nothing to colour, for this young Germany has no reason to fear the judgment of the world.”
Other than that the idea is based on Orwell’s “1984” and the exact quote appears at Harry Potter via Pius Thicknesse’s mouth as “As your new Minister for Magic, I promise to restore this temple of tolerance to its former glory. Therefore, beginning today, each employee will submit themselves… for evaluation. But know this: you have nothing to fear if you have nothing to hide.”
If you want to be extra safe, check that there’s a big block of jumbled characters at the bottom.