One day, an expert in time management was speaking to a group of business students and, to drive home a point, used an illustration those students will never forget.
As he stood in front of the group of high-powered overachievers he said, "Okay, time for a quiz" and he pulled out a one-gallon, wide-mouth mason jar and set it on the table in front of him. He also produced about a dozen fist-sized rocks and carefully placed them, one at a time, into the jar.
When the jar was filled to the top and no more rocks would fit inside, he asked, "Is this jar full?" Everyone in the class yelled, "Yes."
