Whether, if happiness is in the intellective part, it is an operation of the intellect or of the will?

❌ Objection 1 : It would seem that happiness consists in an act of the will. For Augustine says (De Civ. Dei xix, 10,11), that man's happiness consists in peace; wherefore it is written (Ps. 147:3): "Who hath placed peace in thy end [Douay: 'borders']". But peace pertains to the will. Therefore man's happiness is in the will.

❌ Objection 2 : Further, happiness is the supreme good. But good is the object of the will. Therefore happiness consists in an operation of the will.

❌ Objection 3 : Further, the last end corresponds to the first mover: thus the last end of the whole army is victory, which is the end of the general, who moves all the men. But the first mover in regard to operations is the will: because it moves the other powers, as we shall state further on (Question [9], Articles [1],3). Therefore happiness regards the will.

❌ Objection 4 : Further, if happiness be an operation, it must needs be man's most excellent operation. But the love of God, which is an act of the will, is a more excellent operation than knowledge, which is an operation of the intellect, as the Apostle declares (1 Cor. 13). Therefore it seems that happiness consists in an act of the will.

❌ Objection 5 : Further, Augustine says (De Trin. xiii, 5) that "happy is he who has whatever he desires, and desires nothing amiss." And a little further on (6) he adds: "He is most happy who desires well, whatever he desires: for good things make a man happy, and such a man already possesses some good---i.e. a good will." Therefore happiness consists in an act of the will.