I do not set my life at a pin’s fee;
And set my soul, what can it do to that,
Being a thing immortal as itself?

– William Shakespeare

Hamlet, Act 1, Scene 4. The Ghost beckons Hamlet to follow, while Horatio and Marcellus have advised against it. Hamlet says he doesn’t value his life very much because of his grief and melancholy, so why should be fear the ghost?