Out , out brief candle life is but a walking shadow , a poor player
"Out, out" -similiar to LM "out damned spot" to show the how they are similiarly evil or it could show how atuned they are to emphasise his love for her.
Image of light in his cangle is a Chrisitian image to show his love for his wife overpowers his love for God.
"a poor player" means an actor playing a part to show his nilhistic view on how life is pointless.
He dismisses responsibility and blames the scriptwriter (God) which is ironic as he has been acting out on his free will