Gregory of Nazianzus

The same thing applies to the word Lord, which is also used as a name of God. "I am the Lord your God," he says. "This is my name," and "The Lord is his name." But we are making deeper enquiries into a nature that has absolute existence, independent of anything else. The actual, personal being of God in its fullness is neither limited nor cut short by any prior or any subsequent reality—so it was, and so it will be.