The ultimate end of things is necessarily the divine goodness. For the ultimate end of things produced by one who works through his will is that which is chiefly and for its own sake willed by the agent. It is for this that the agent does all that he does. But the first object willed by the divine will is God’s goodness, as is clear from a previous discussion. Hence the ultimate end of all things made by God must necessarily be the divine goodness.
Furthermore, the end of the generation of everything that is generated is its form. Once this is achieved, generation ceases. For everything that is generated, whether by art or by nature, is in some way rendered similar to the agent in virtue of its form, since every agent produces an effect that has some resemblance to the agent himself. Thus the house that is realized in matter proceeds from the house existing ideally in the mind of the architect. In the realm of nature, likewise, man begets man. And if anything that is generated or effected by natural processes is not like its generating cause according to species, it is at any rate likened to its efficient causes as imperfect to perfect. The fact that a generated product is not assimilated to its generating cause according to species, is explained by its inability to rise to perfect likeness with its cause; but it does participate in that cause to some extent, however imperfectly. This occurs, for example, in animals and plants that are generated by the power of the sun. Hence in all things that are made, the end of their generation or production is the form of their maker or generator, in the sense that they are to achieve a likeness of that form. But the form of the first agent, who is God, is nothing else than His goodness. This, then, is the reason why all things were made: that they might be assimilated to the divine goodness.
St. Thomas Aquinas. (1265-1274). Compendium Theologiae: Divine Goodness as the Ultimate End the Reason for Diversity in Things, trans. by Cyril Vollert. St. Louis & London: B. Herder Book Co., 1947
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