Lyric discussion by KickingWing 

Cover art for Chlorine lyrics by Twenty One Pilots

The song is clearly about Tyler's love/hate relationship with songwriting. What was once a way to deal with his anxiety and depression is now a job. His body lives on lead (a pencil). Lead is terrible in flavor because it is hard to draw on the feelings that make great songs but NOW the lead doubles as a "paper maker" meaning he earns paper writing now.

The entire album is inspired by the time he spent quarantined at home creating a new world in his mind. Pet Cheetah mentions locking himself in a room for 8 hours a day for 8 days straight without a line to show for it.

Loving to hate the fight is simply the internal struggle to do something that while therapeutic is also a full time job now.

Song Meaning

@KickingWing And running for his life means he's running away from God and toward the addiction to making music. That's why he asks God at the end if he can build his house (his body in heaven, which the Bible calls our "house").