Introversion means looking in too closely.

Extroversion means being able to look outward.

A person who has his attention continually fixed upon some object or at some distance from his eyes during work should fix his attention somewhere different after working hours.

You will become so tired that you “know” now that you should go to bed and have a good night’s sleep. But this is not the time to stop walking, as you are walking through the exhaustion. You are, in fact, making the exhaustion go away by walking, but you are not yet done. You are not handling the exhaustion by physical exercise. The physical exercise has always appeared to be the more important thing to people, but the exercise is unimportant. What is important is the action of unfixing your attention from your work and placing it on the things around you in the world in which you are living.