The story goes that a speaker was addressing his audience at a conference. He pulled a large glass jar from under the podium, placed it on a table and proceeded to fill the jar with rocks. He looked at the jar, then looked at the audience and asked, "Is the jar full?"
Everyone responded, "Yes." He pulled out a bag of pebbles and emptied the pebbles into the jar. They settled amongst the crannies between the rocks. When he couldn't fit another pebble into the jar, he asked, "Is the jar full?"
The audience was not as quick to respond, but most answered, "Yes, now it's full." He pulled out a bag of sand. He poured the sand into the jar. The sand filled the spaces between the pebbles. He asked, "Is the jar full?"
By this time, the audience wasn't sure what would happen next, but finally responded, "Yes, now the jar is full."
The speaker paused, looked at the jar, and said, "If I hadn't placed the rocks in the jar first, I wouldn't be able to put even one rock in that jar."
Think of a rock as a goal which leads to a significant accomplishment.
Your rocks won't look like mine, but the idea behind accomplishing rocks is the same -- you're going to throw rocks into your days and let some of the pebbles and sand wait for a while.