Q: Whether Man's Happiness Consists in the Vision of the Divine Essence?

A: On the contrary,
It is written (1 John 3:2): "When He shall appear, we shall be like to Him; and [Vulg.: 'because'] we shall see Him as He is."

I answer that,
Final and perfect happiness can consist in nothing else than the vision of the Divine Essence. To make this clear, two points must be observed. First, that man is not perfectly happy, so long as something remains for him to desire and seek: secondly, that the perfection of any power is determined by the nature of its object. Now the object of the intellect is "what a thing is," i.e. the essence of a thing, according to
De Anima
iii, 6. Wherefore the intellect attains perfection, in so far as it knows the essence of a thing. If therefore an intellect knows the essence of some effect, whereby it is not possible to know the essence of the cause, i.e. to know of the cause "what it is"; that intellect cannot be said to reach that cause simply, although it may be able to gather from the effect the knowledge that the cause is. Consequently, when man knows an effect, and knows that it has a cause, there naturally remains in the man the desire to know about the cause, "what it is." And this desire is one of wonder, and causes inquiry, as is stated in the beginning of the
Metaphysics
(i, 2). For instance, if a man, knowing the eclipse of the sun, consider that it must be due to some cause, and know not what that cause is, he wonders about it, and from wondering proceeds to inquire. Nor does this inquiry cease until he arrive at a knowledge of the essence of the cause.

If therefore the human intellect, knowing the essence of some created effect, knows no more of God than "that He is"; the perfection of that intellect does not yet reach simply the First Cause, but there remains in it the natural desire to seek the cause. Wherefore it is not yet perfectly happy. Consequently, for perfect happiness the intellect needs to reach the very Essence of the First Cause. And thus it will have its perfection through union with God as with that object, in which alone man's happiness consists, as stated above (AA. 1, 7; Q. 2, A. 8).

Reply Obj. 1: Dionysius speaks of the knowledge of wayfarers journeying towards happiness.

Reply Obj. 2: As stated above (Q. 1, A. 8), the end has a twofold acceptation. First, as to the thing itself which is desired: and in this way, the same thing is the end of the higher and of the lower nature, and indeed of all things, as stated above (Q. 1, A. 8). Secondly, as to the attainment of this thing; and thus the end of the higher nature is different from that of the lower, according to their respective habitudes to that thing. So then in the happiness of God, Who, in understanding his Essence, comprehends It, is higher than that of a man or angel who sees It indeed, but comprehends It not.

QUESTION 4

OF THOSE THINGS THAT ARE REQUIRED FOR HAPPINESS (In Eight Articles)

We have now to consider those things that are required for happiness: and concerning this there are eight points of inquiry:

(1) Whether delight is required for happiness?

(2) Which is of greater account in happiness, delight or vision?

(3) Whether comprehension is required?

(4) Whether rectitude of the will is required?

(5) Whether the body is necessary for man's happiness?

(6) Whether any perfection of the body is necessary?

(7) Whether any external goods are necessary?

(8) Whether the fellowship of friends is necessary?