 According to Thomas Aquinas, God’s presence is to be understood in terms of God’s power, knowledge and essence. (In this view he followed a formula put forth by Peter Lombard (late 11th C.–1160) in his Sentences, I, xxxvii, 1.) He writes, “God is in all things by his power, inasmuch as all things are subject to his power; he is by his presence in all things, inasmuch as all things are bare and open to his eyes; he is in all things by his essence, inasmuch as he is present to all as the cause of their being” (Summa Theologica I, 8, 3). Aquinas attempts to motivate this claim with some illustrations: