De Somniis (lib. i-ii)

Then because we were not able to bear the weight of the whole trunk of wisdom, we cut off one branch and one bunch of grapes, and carried it with us as a most undeniable proof of our joy, and a burden very easy to be borne, wishing to display at the same time the branch and the fruit of excellence to those who are gifted with acuteness of mental sight, to show them, that is, the strongly-shooting and grape-bearing vine.

They then very fairly compare this vine of which we were only able to take a part, to happiness. And one of the ancient prophets bears his testimony in favour of my view of the matter, who speaking under divine inspiration has said, "The vineyard of the Lord Almighty is the house of Israel." [*](Isaiah v. 7. )