Truth

"Ye shall know the truth, and the truth shall make you free."  John 8:32

"The truth will set you free, but first it will piss you off."  Gloria Steinem

"Some things that are true are not very useful."  Boyd K. Packer (president of the quorum of the twelve apostles of the mormon church)

Sorry, Boyd, I'm going to go with the John & Gloria on this one.  I have never felt so free in my life!  (And trust me when I tell you that I'm very pissed off.)