Got this today from my manager. I have seen it before, but had forgotten how true it is.
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 over-achievers 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." The time management expert replied, "Really?"
He reached under the table and pulled out a bucket of pebbles. He dumped some pebbles in and shook the jar causing pieces of pebbles to work themselves down into the spaces between the big rocks. He then asked the group once more, "Is the jar full?"
By this time the class was on to him. "Probably not," one of them answered. "Good!" he replied. He reached under the table and brought out a bucket of sand. He started dumping the sand in the jar and it went into all of the spaces left between the rocks and the pebbles. Once more he asked the question, "Is this jar full?" "No!" the class shouted. Once again he said, "Good." Then he grabbed a pitcher of water and began to pour it in until the jar was filled to the brim.
Then he looked at the class and asked, "What is the point of this illustration?" One eager beaver raised his hand and said, "The point is, no matter how full your schedule is, if you try really hard you can always fit some more things in it!" "No," the speaker replied, "that's not the point.
The truth this illustration teaches us is, "If you don't put the big rocks in first, you'll never get them in at all.”