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Maybe there’s a way out of the cage where you live
Maybe one of these days you can let the light in
Show me how big your brave is
I think that this line means that if you just let people bully you and you just let their words hurt you then they will keep doing the same thing to you. I also think that this line means that you should not let other people words hurt you, you should open up your mouth and tell them what you are thinking to.