# you, Lord God Almighty, the one who is and who was

"you, Lord God, the ruler over all. You are the one who is, and you are the one who was" 

# the one who is

"the one who exists" or "the one who lives"

# who was

"who has always existed" or "who has always lived"

# you have taken your great power

"you have defeated with your power everyone who has rebelled against you"