"Focus is a matter of deciding what things you're not going to do"

John Carmack's quote talks to the importance of focus in accomplishing success. It recommends that in order to focus on the things that are very important to us, we should be willing to make decisions about what we are not going to do. This suggests that we need to be willing to let go of activities and tasks that are not vital to our objectives. By doing this, we can focus on the things that are essential to us and commit our time and energy to them. This enables us to be more productive and effective in our work, and eventually achieve our objectives. Simply put, John Carmack's quote motivates us to be conscious of our decisions and to concentrate on the things that are essential to us.