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St. Thomas Aquinas discusses the question "Whether in creatures is necessarily found a trace of the Trinity?" in his Summa Theologica I q. 45 a. 7. He writes:
β¦the processions of the divine Persons are referred to the acts of intellect and will, as was said above (q. 27). For the Son proceeds as the word of the intellect; and the Holy Ghost proceeds as love of the will. Therefore in rational creatures, possessing intellect and will, there is found the representation of the Trinity by way of image, inasmuch as there is found in them the word conceived, and the love proceeding.