A newly arrived soul in Heaven was met by St. Peter. The saint toured the soul around Heaven. Both of them walked side by side inside a large workroom filled with angels.
St. Peter stopped in front of the first section and said, "This is the Receiving Section. Here, all the petitions to God said in prayer are received." The soul looked at the section, and it was terribly busy with so many angels sorting out petitions written on voluminous paper sheets from all the people of the world.
They walked again until they reached the 2nd section, and St. Peter told the soul, "This is the Packaging and Delivery Section. Here, the graces and blessings the people asked for are packed and delivered to the persons who asked for them down on earth."
The soul saw how busy it was. There were so many angels working in that room, since so many blessing were being packed and delivered to Earth.
Finally at the farthest corner of the room, the soul stopped at the last section. To the surprise of the soul, only one angel stayed there idly, doing nothing. "This is the Acknowledging Section," St. Peter told the soul. "How is it that, there is no work here?" "That's the sad thing," St. Peter answered. "After the people received the blessings they asked for, very few send their acknowledgments." "How does one acknowledge God's blessing?" "Simple," St. Peter answered. "Just say, "'Thank you, Lord'."