Hamlet in Act 3, Scene 1 at the end of the "To be or not to be" soliloquy notices Ophelia's approach and says "Nymph, in thy orisons be all my sins remembered." Hamlet is asking Ophelia to pray for him to be forgiven his sins.
Thorium 232 is actually the most stable isotope of thorium having a half-life of about 14 billion years.