Truth.

"Knowing can be a curse on a persons life. I'd traded in a pack of lies for a pack of truth, and I didn't know which one was heavier. Which one took the most the strength to carry around? It was a ridiculous question, though, because once you know the truth, you can't ever go back and pick up your suitcase of lies. Heavier or not, the truth is yours now." -The Secret Life of Bees