The Greek myth of Cassandra ("A common version of her story is that, in an effort to seduce her, Apollo gave her the power of prophecy—but when she refused him, he spat into her mouth to inflict a curse that nobody would ever believe her prophecies.") shows that the ancient Greeks probably thought that people who knew the truth often had difficulty being believed, and this imposed great costs on communities. (The Greek myths can be thought of as guides as to how you are supposed to live.)