One of my favorite quotes by Fr. Hans Urs von Balthasar:
"Jesus must be Catholic, otherwise his Church, which follows him and is promised his fullness, could not be called Catholic. Being Catholic means embracing everything, leaving nothing out. How can an individual human being do this, even if he is the only begotten Son of God? We shall not explain this by theological speculation. It is something that can reveal itself to us only if, in the openness of faith, we let our eyes rest on his self-manifestation. He is the revelation of someone else, of the Father, who is 'greater' than he, and yet with whom he is 'one.' This is the message of his words and his life. ...
A Church can be Catholic only because God is Catholic first, and because, in Jesus Christ and ultimately in the Holy Spirit, this catholicity on God's part has opened itself to the world, simultaneously revealing and giving itself. The Spirit is 'Person', the 'We' in God: he provides the basis for the 'we' that exists between God and ourselves, and hence too between men. But we would know and possess nothing of this if Jesus Christ had not stood at the alpha and omega of all God's ways in the world, as the form of revelation available to anyone who is open to it, i.e., is prepared to believe."
(From In The Fullness of Faith: On the Centrality of the Distinctively Catholic,
@IgnatiusPress)