A philosophy professor stood before his class and had some
items in front of him.

When the class began, wordlessly he picked up a large empty
mayonnaise jar and proceeded to fill it with rocks, rocks about
2" in diameter.

He then asked the students if the jar was full. They agreed
that it was. So the professor then picked up a box of pebbles
and poured them into the jar. He shook the jar lightly. The
pebbles, of course, rolled into the open areas between the
rocks. He then asked the students again if the jar was full.
They agreed it was. The students laughed. The professor
picked up a box of sand and poured it into the jar. Of course,
the sand filled up everything else.

"Now," said the professor, "I want you to recognize that this is
your life. The rocks are the important things - your family,
your partner, your health, your children - things that if
everything else was lost and only they remained, your life
would still be full. The pebbles are the other things that matter
like your job, your house, your car. The sand is everything
else, the small stuff.

"If you put the sand into the jar first, there is no room for the
pebbles or the rocks. The same goes for your life. If you spend
all your time and energy on the small stuff, you will never have
room for the things that are important to you. Pay attention to
the things that are critical to your happiness. Take care of the
rocks first - the things that really matter. Set your priorities.
The rest is just sand."

But then a student then took the jar which the other students
and the professor agreed was full, and proceeded to pour in a
glass of beer. Of course the beer filled the remaining spaces
within the jar making the jar truly full.

The moral of this tale is: no matter how full your life is, there
is always room for beer.