I like to collect quotations and here is a favorite: "He does not believe that does not live by his belief."
For me, this means that I need to let my actions reflect my beliefs. Actions of kindness, compassion, and forgiveness, regardless of what my thoughts may be.
The quote was written by Thomas Fuller, a 17th century churchman who was one of the first English writers to be able to live by his writings. His book, "Worthies of England," was published after his death.