Glass, nutz, bean

There was a professor whose suppose to give the class a lesson on life.
Given a glass cup, chest nutz and green beans

Professor filled up the glass with nutz and ask the student if he's able to input the beans.
On second scenerio, professor filled up the glass with beans first and ask the student if he's able to input the nutz.

Professor then ask the students what can you guys related the actions to life ?
Lots of interesting answer pop up but none of them match professor thoughts.

Just before the lesson end, professor explained:
There are lots of things that happen in life, if you are dwelling in tiny little stuffs there wont be space for major stuffs in your life. Thus set your major things/objectives you want in life and let the beans flow pass.