Byron Katie likes to say that there are only three kinds of business in the world: mine, yours, and God's. God's business refers to the forces of Nature or to events that are beyond human control. Your business, is someone else's life, including what they feel, think, and choose to do. My business is what's left, that is, what is within my control.

In his popular book, The 7 Habits of Highly Effective People, Stephen Covey describes the notion of Circle of Concern and Circle of Influence. We add here the Circle of Control, where

Circle of Control = What I choose to do and can directly manipulate. Circle of Influence = What is not directly within my control, but can be affected by what I do. Circle of Concern = What I mentally worry about, whether or not I can do anything about it.