That attribute of God by which He is the self-sufficient ground of His own existence and being. Negatively expressed, independence says only what God is not. Self-existence is precisely the adequate affirmation here. Proof texts: Acts 17:25; John 5:26.
Reformed Dogmatics ed. Richard B. Gaffin and Richard de Witt, trans. Annemie Godbehere et al., vol. 1 (Bellingham, WA: Lexham Press, 2013), 13.