Whether God is the supreme good?

Objections

Objection 1 : It seems that God is not the supreme good. For the supreme good adds something to good; otherwise it would belong to every good. But everything which is an addition to anything else is a compound thing: therefore the supreme good is a compound. But God is supremely simple; as was shown above (Question [3], Article [7]). Therefore God is not the supreme good.
Objection 2 : Further, "Good is what all desire," as the Philosopher says (Ethic. i, 1). Now what all desire is nothing but God, Who is the end of all things: therefore there is no other good but God. This appears also from what is said (Lk. 18:19): "None is good but God alone." But we use the word supreme in comparison with others, as e.g. supreme heat is used in comparison with all other heats. Therefore God cannot be called the supreme good.
Objection 3 : Further, supreme implies comparison. But things not in the same genus are not comparable; as, sweetness is not properly greater or less than a line. Therefore, since God is not in the same genus as other good things, as appears above (Question [3], Article [5]; Question [4], Article [3]) it seems that God cannot be called the supreme good in relation to others.