God is alive, the very source of life. Jesus announced:
John 5:26 The Father has life in himself. . . .
As the source of life, God did not derive his life from anything or anyone else. No other life source exists. He is it! He has always been alive, which is in contrast to all created beings. Rather, he began life, and gave it to all created beings.
Furthermore, the continuation of his life doesn’t depend on anything else outside himself, because he is the eternal source of all life. He doesn’t even need to will his own existence – he simply is! God is alive, the very source of life.