The historic Christian doctrine of God, articulated across the fathers, medieval scholastics, and Reformation orthodox, holding that God is simple (without parts), eternal (not bound by time), immutable (does not change), impassible (not moved by external causes), omnipotent (all-powerful), omniscient (all-knowing), omnipresent (everywhere present), aseity (self-existent, self-sufficient), and perfect (lacking nothing). Distinguished from modern theological revisions that compromise one or more of these attributes: process theology (denying immutability and impassibility), open theism (denying exhaustive divine foreknowledge), pantheism (collapsing God into creation), panentheism (folding creation into God), and various neo-classical positions that retain some attributes while abandoning others. The classical attributes are not philosophical impositions on Scripture but are derived from Scripture's own portrayal of God: Mal 3:6 (I am the LORD, I change not); Ps 90:2 (from everlasting to everlasting, thou art God); Acts 17:28 (in him we live, and move, and have our being); 1 Tim 6:16 (who only hath immortality, dwelling in the light which no man can approach unto). The doctrine grounds the reliability of God's promises, the trustworthiness of His character, and the foundation of all creaturely worship.