spell from a dream

"make fire of water,
make water of fire,
light of dark,
dark of light,
air of earth,
earth of air,"
the part thats not of the spell says:
"when spoken by mortal lips this may change the fabric of a being"
i have no idea what this may mean but im putting this up so anyone can try to get some meaning from it cause i am completely clueless about it.

it could mean it changes the persons way of thinking, idk thats just one idea