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In this article, St. Thomas begins to consider goodness in itself, rather than merely in its relation to Being.
Here, St .Thomas proves that goodness has the aspect of final causality. For, the final cause is the reason for which something does something, e.g., I eat that I may be filled.
From a brief consideration of things, the conclusion drawn is obvious. For, we do things because we desire some thing. Now, that which is desirable is the good. Therefore...