What could it mean?...

 And the Word became flesh and dwelt among us, 

full of grace and truth; we have beheld his glory, 

glory as of the only Son from the father. - John 1:14

"A cloud of incense was rising on high;

the people suddenly all bowed low; what could it mean?

The truth flashed on him, fearfully yet sweetly;

it was the Blessed Sacrament - it was the Lord Incarnate

who was on the altar, who had come 

to visit and bless His people. 

It was the Great Presence, which makes a Catholic Church

different form every other place in the world, 

which makes it, as no other place can be - holy."

Saint John Henry Newman

Loss and Gain:  The Story of a Convert