Lay Down Your Goddamn Arms

"I’m not of this world. You’re not in this heart. This isn’t in me."

He doubts, now, whether or not he should do what he has to for a woman.

"To open this box, you can’t shoot the lock. I hide everything, so you can’t see."

He doesn't open himself up to her, and so she will never know who he is inside

"You want to fight? You want to fuck? You want to die? Try your luck. Lay down your goddamn arms."

He's saying that she couldn't handle him and who he is.

"There isn’t a key you can use on me. There isn’t a key, so lay down your arms."

There isn't a way she can get to know who he is

"You’re a book every page is written in words I cannot read. So I burn, got to burn it."

He can't figure her out so he thinks its better to let her go

In this song, he admits he doubts being able to be "human." It ties together the theme to a couple other songs on this album as well. (i.e. Hey, Cruel World..., The Gardner)

He is describing himself as a person no one will be able to figure out, nor may anyone ever figure out who he is. But to him, the only important thing is that he knows who he is.