In act 5 scene 5 Macbeth finds out his wife has died and then says that she should of died afterwards because he has no time to mourn her with this upcoming battle he has too much on his mind, he is also saying how life can go within a instant at this point I think Shakespeare is speaking to his audience because I believe he is speaking from his heart, it is true that life can instantly flicker off within in a second so live life because life is to short.