The phrase is also translated as "I am that (I) am", "I will become what I choose to become", "I am what I am", "I will be what I will be", "I create what(ever) I create", or "I am the Existing One".
it just keeps getting better, it reflects Gods nature as ananta as well (without end), and as creator and material cause. is there any denying such a thing comes from God?