Found this on the same blog i was following.
Please understand how much life can mean to anyone.

When things in your life seem almost too much to handle, when 24 hours in a day are not enough, remember the mayonnaise jar and the two cups of coffee.

A professor stood before his class of philosophy students with a few objects on the table before him. When the class started he silently lifted a very big and empty glass mayonnaise jar and started to fill it up with golf balls. He then asked his students if the jar was full. The students said that yes it was. Then the professor took a box of little pebbles and poured them into the jar as well. He shook it and the pebbles filled up the small spaces in between the golf balls. Again he asked the students if the jar was full and the students said yes it was. Then the professor took a box filled with sand and poured it into the jar. The sand filled the rest of the empty space between the golf balls and the pebbles and once again he asked if the jar was full. The students answered with a unanimous YES! Then the professor placed two cups of coffee on the table and silently poured them into the jar and they efficiently filled the last space left between the grains of sand. The students laughed.

"Now," the professor said, when the room was silent again, "I want you to imagine that the jar represents your life. The golf balls are all the important things, family, children, your health and other things that you are passionate about. Things – that if everything else was lost and only these things remained, your life would still be good and fulfilled. The pebbles represent other things that are important to you, a home, a job and a car maybe. The sand represents everything else – the little things! If you put the sand in the jar first, then you have no space left for the golf balls or the pebbles. It`s the same thing with life. If you put all your time and energy on the little things then there is no space left for the really important things. So be attentive to what's important for your happiness and fulfillment. Spend time with your children. Take your partner out to dinner. Do things that you are passionate about. Take care of the golf balls first – the things that are really important to you. There is always another day for cleaning the house. Restore what is important in your life – the rest is just sand."

One of the students asked, “ What does the coffee represent?” The professor smiled and said, "I'm glad you asked. The coffee is there because I wanted to show you that however hectic and crammed your life might feel there is always time for a cup of coffee with a friend!"