According To The Teaching of St. Thomas Aquinas
PART FIRST.
CHAPTER II
How This Common and Ordinary Presence is Intimate, Profound and Universal. Its Different Degrees
Such barriers are unknown to the Divine causality; it is universal and reaches out to every place and thing: substances, faculties, habits, operations, everything that is real and positive comes from it, is its work—all except evil and sin. Without the Divine causality nothing can come into existence; without it, nothing can continue to exist, without God, of Whom it is said that He upholdeth "all things by the word of His power." (Hebrews i. 3.) Again, without His actual and immediate influence, no created agent can act: "Lord, Thou hast wrought all our works for us;" (Isaias xxvi. 12.) even our free will cannot escape His almighty action: "For it is God Who worketh in you both to will and to accomplish, according to His good will." (Philippians ii. 13.) God then is present everywhere as the First Cause—in the centre, in the radius, and in the circumference of every being.
Whatever be the nature of the effect produced; whatever be the order to which this effect belongs; be it an inanimate or animate being, a soul to be created, to be preserved, to be justified, a natural or supernatural gift to be conferred, a faculty to be set in action; in a word, as soon as we have anywhere an effect of the Divine causality, there we are sure to find God in His very self in the capacity of active principle. ( St. Thomas, Contra Gent, 1, IV., c. xxl.)