I had trouble making 4th and 5th graders understand the gravity of what they do when they receive Communion, understand how truly awesome is the gift we are givne.
Unsurprising, with the casual way reception of the sacrament is modeled for them, at least for the most part.
I shall keep trying...

“Tell me, if anyone gave you gold-dust, would you not take hold of it with every possible care, ensuring that you did not mislay any of it or sustain any loss?”

 

(A thanks to Fr Z for this quote from St Cyril of Jerusalem)