The speaker is directing the song towards the theme ‘freedom’ “give me freedom,fire,reason”these metaphors used by the writer is saying that these are what is needed to take things to a higher level as seen in the following phrase,”take me higher”Freedom represents the power of right to act or speak,which shows the intensity the writer wants to take things higher.The word fire also could represent inspiration,which also is a powerful thing to use to take things more bigger.