A philosophy professor once stood before his class with a large empty jar. He filled the jar with large rocks and asked his students if the jar was full.

The students said that yes, the jar was full.

He then added small pebbles to the jar and asked again, “Is the jar full now?”

The students agreed that the jar was indeed full.

The professor then poured sand into the jar and asked again.

The students then agreed that the jar was finally full.

The professor went on to explain that the jar signifies one’s life.

The rocks are equivalent to the most important things in your life, such as family, health, and relationships. And if the pebbles and the sand were lost, the jar would still be full and your life would still have a meaning.

The pebbles represent the other things that matter in your life, such as your work, school, and house. These things often come and go, and are not permanent or essential to your overall well-being.

And finally, the sand represents the remaining small stuff and material possessions in your life. These things don’t mean much to your life as a whole and are likely only done to waste time or get small tasks accomplished.

The metaphor here is that if you start with putting sand into the jar, you will not have room for rocks or pebbles. This holds true for the things you let into your life too.