That which is, is more than that which can be, more than that which is on the road to be. This principle led Aristotle and Aquinas to find, at the summit of all reality, pure act, understanding of understanding, sovereign and good. But Aquinas rises above Aristotle and Leibnitz, for whom the world is a necessary consequence of God. St. Thomas shows, on the contrary, the reason why we must say with revelation that God is sovereignly free, to create or not to create, to create in time rather than from eternity. The reason lies in God’s infinite plenitude of being, truth, and goodness, which creatures can do noting to increase. After creation, there are more beings, it is true, but not more being, not more perfection, wisdom, or love. “God is none the greater for having created the universe.” God alone, He who is, can say, not merely “I have being, truth, and life,” but rather “I am being itself, truth itself, life itself.”
Hence the supreme truth of Christian philosophy is this: In God alone is essence identified with existence. The creature is only a capability to exist, it is created and preserved by Him who is. Further, the creature, not being its own existence, is not its own action, and cannot pass from potency to act, either in the order of nature or in that of grace, except by divine causality.
We have thus shown how Thomism is an elevated synthesis, which, while it rejects unfounded denials, assimilates the positive tendencies of current philosophical and theological conceptions. This synthesis recognizes that reality itself is incomparably more rich than our ideas of that reality. In a word, Thomism is characterized by a sense of mystery, which is the source of contemplation. God’s truth, beauty, and holiness are continually recognized as transcending all philosophy, theology, and mysticism, as uncreated richness to be attained only by the beatific vision, and even under that vision, however clearly understood, as something which only God Himself can comprehend in all its infinite fullness. Thomism thus keeps ever awake our natural, conditional, and inefficacious desire to see God as He is. Thus we grow in appreciation of the gifts of grace and charity, which move us, efficaciously, to desire and to merit the divine vision.
This power of assimilation is therefore a genuine criterion whereby to appraise the validity and scope of Thomism, from the lowest material elements up to God’s own inner life. Economy demands that any system have one mother-idea, as radiating center. The mother-idea of Thomism is that of God as pure act, in whom alone is essence identified with existence. This principle, the keystone of Christian philosophy, enables us to explain, as far as can be done here below, what revelation teaches of the mysteries of the Trinity and the Incarnation, the unity of existence in the three divine persons, the unity of existence in Christ. It explains likewise the mystery of grace. All that is good in our free acts comes from God as first cause, just as it comes from us as second causes. And when we freely obey, when we accept rather than resist grace, all that is good in that act comes from the source of all good. Nothing escapes that divine and universal cause, who without violence actualizes human freedom, just as connaturally as He actualizes the tree to bloom and bear fruit.
Let Thomism then be judged by its principles, necessary and universal, all subordinated to one keystone principle, not a restricted principle as is that of human freedom, but by the uncreated principle of Him who is, on whom everything depends, in the order of being and activity, in the order of grace and nature. This is the system which, in the judgment of the Church, most nearly approaches the ideal of theology, the supreme branch of knowledge.
– Reginald Garrigou-Lagrange, Reality: A Synthesis of Thomistic Thought –
– Lucas G. Westman