Hence it appears that the means to happiness, and the end itself, are essentially the same thing, to wit, union of the spirit with God, and differ only in degrees. And the union which Adam during his state of innocence did and would always have practised was in a sort perpetual, never being interrupted (except perhaps in sleep). For, loving God only and purely for Himself, he had no strange affection to distract him, and the images of creatures, which either by his consideration of them, or operations about them, did adhere to his internal senses, did not at all divert his mind from God, because he contemplated them only in order to God; or rather he contemplated God alone in them, loving and serving Him only in all his reflections on them, or workings about them. So that creatures and all offices towards them served as steps to raise Adam to a more sublime and more intimate union with God; the which was both his duty and his present happiness, besides that it was a disposition to his future eternal beatitude.
Dom Augustine Baker, Holy Wisdom