Self-Existent -- There is nothing upon which God depends for His existence except Himself. The whole basis of His existence is within Himself. There was a time when there was nothing but God Himself. He added nothing to Himself by creation.
God said to Moses, “I AM WHO I AM. This is what you are to say to the Israelites: ‘I AM has sent me to you.’
For as the Father has life in himself, so he has granted the Son also
to have life in himself.