Mean's I'm not sure I'd give up my love for peace. It's significant since it reveals the narrator's perspective. It establishes a subject by demonstrating how the narrator feels about love. 
Personification is a poetic device used by Edna St. Vincent Millay in Sonnet 30. This is the line that demonstrates personification. "Yet many a man is making friends with death." This is referred to as personification because it adds a human-like quality to an idea, in this case death. This adds to the poem's message by implying that individuals who do not have love in their life are essentially befriending death.
You can't be saved or healed by love. Another good example of the concept of not needing love to live. It's significant because it demonstrates that you need oxygen to live, and love won't provide it. It expands on the theme since it clarifies the poem's meaning.
Love can not fill the thickened lung with breath,
Because it emphasizes death, the turn in line seven attracts the reader's attention even more. It says before the turn that love can't offer you food or drink. Love can't offer you a good night's sleep or provide a roof over your head. Love is incapable of cleaning up blood or repairing a broken bone. The poem then emphasizes sorrow after the turn, signaling a shift in emotion. In this scenario, the turn establishes a sense of sadness when a person's life is lacking of love.
I might be driven to sell your love for peace
If you're depressed, you might consider abandoning them for the sake of peace. Some people will be disappointed by your decision, but it is the best option for you. It's significant because it represents a shift in the poem's emotional tone.
Love is not all: it is not meat nor drink
You do not require love in your life. You can't live without food or water, but you can live without love. This is the poem's very first line. It's good since it rapidly gets to the point. It is significant since it introduces the poem's concept. It establishes a theme by stating that love is not a requirement in life.