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I think this song is about someone who is reliving a relationship.

'Still I always, look up to the sky. Pray before the dawn'

Remembering the better moments of the relationship and hoping even praying that it will go back to that.

'Cause they fly always. Sometimes they arrive Sometimes they are gone'

This could symbolise that the people he loves are always out of reach and when they arrive it is sweet but the pain returns when they are gone.

'Fly on'

This is a message telling his other half to move on. Be free and find something better than what they had.

'Maybe one day I'll fly next to you'

This, I think means that one day he'll move on too and they'll both be able to look back on it not as a lesson learned but as a fond memory.

This is one of my favourites from the album. It's beautiful and I listen to it on repeat. Cannot fault it at all. Beautiful.