"Tonight I can Write" is an interesting poem defiantly one describing a persons love for another.  Neruda begins the poem talking about the first feelings of love towards someone.  This caring extends to a perseverance for he mentions about sad lines and not having her this separation is killing him, but when he tries to focus on the night his memories haunt him of her.  Then it sounds like in the end he ends his life or he just happens to die at the expense of losing the love of his life.  This poem goes to a slight extreme of to the extent of death, because no one is worth dying for you, because you have your certain niche in the world and taking that away would be a tragedy.