The truth is something that mankind, for some mysterious reason, instinctively dislikes. Every man who tries to tell it is unpopular, and even when, by the sheer strength of his case, he prevails, he is put down as a scoundrel.
-H.L. Mencken
Counterexamples: Exhibit A: The battle of Marathon. Exhibit B: Teachers.
Mencken probably meant "inconvenient" truths. If you insert this qualifier, the rest of the phrase becomes trivial.
Here's the new quotes thread, for all those quotes you were going to post.
Rules: