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It is that perfection of God by which he is devoid of all change, not only in His Being, but also in His perfections, and in His purposes and promises.

Louis Berkhof (1996). “Systematic Theology”, Wm. B. Eerdmans Publishing
It is that perfection of God by which he is devoid of all change, not only in His Being, but also in His perfections, and in His purposes and promises.