Big Rocks

I collect football-sized river rocks to line the path through my wildflower woodland. The excavation has unearthed a dozen of these plus a few small boulders--all left behind from the glacial wash-out of the last Ice Age.

Have you heard the story about the master who fills a large jar with fist-sized rocks and then asks the student, "Can i fit any more in here?"
The student says, "No."
The master then takes some gravel and shakes it into the spaces between the rocks. Then he asks the student, "Can i fit any more in here?"
The student says, "Well, i suppose so."
The master then uses sand, which sifts into the spaces between the gravel. Then he asks the student, "Can i fit any more in here?"
The student shakes his head doubtfully.
The master fills the jar with water. "Now," he asks, "what's the lesson here?"
"Well, you can always fit more in," the student sighs.
"No," says the master.  "Put the big rocks in first."

We live our lives as if we can always fit more in.
What are your "big rocks"?