In my initial post on the Catechism I noted the word Highest added in Question 1, that is not in the Shorter version.
Q. 1. What is the chief and highest end of man?
A. Man’s chief and highest end is to glorify God, and fully to enjoy him forever.
Perhaps there can be no higher end for man than what Jesus prayed to the Father for us written in John’s Gospel. To be one, to be with them in Heaven, and that we may behold his glory. There can be no higher end.
Joh 17:21 That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.
Joh 17:22 And the glory which thou gavest me I have given them; that they may be one, even as we are one:
Joh 17:23 I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.
Joh 17:24 Father, I will that they also, whom thou hast given me, be with me where I am; that they may behold my glory, which thou hast given me: for thou lovedst me before the foundation of the world.