Does spirit exist after death?

Who is right and who is wrong? 

If a man cannot tell whether he is dead or alive, I do not see how anybody else can. Look at me―examine me critically [straightening up to his fullest extent]―feel me and see if my muscles are not as hard and rotund as yours. Look at my teeth [opening his mouth] and see for yourself if they are not as perfect as anybody's. Hear that [stamping one of his feet on the floor] and then tell me if you can that a dead man can make such a noise as that. I have seen plenty of people carried away with all sorts of hallucinations, but never before heard of anything half so foolish and silly as this. 

Now, sir, after listening to what I have said and done in your presence, tell me, upon the honour of a gentleman, if you think I am in reality a dead man?