The spirit of constant and total self-gift is what gives joy. 

Most people spend their entire life resisting what seems like either pablum, blather, or a paradox.

The beautiful idea of the Communion of Saints is generally barely understood by most Catholics.

The idea is that - through the Body of Christ - we are intimately & in a very real way "connected".

Your heroic sacrifice for your family in Chicago can benefit me in some real way in my home state. 

My lack of sacrifice or sincerity in facing the motives for my "un-gift" in my family can effect a priest on the other side of the world.

We are connected. My strivings, your strivings to love with the very heart of Christ can materially help priests, but not just "generic priests", but this or that priest or lay person.

So our "lack of generosity" in living family life can cause shortages of "generosity" elsewhere, including the priesthood. 

It takes faith to fully live the "Communion of Saints", but it leads to joy