He is speaking in the context of once you set a goal then don't quit. Eg: I have to get a job in one month. Now, once you define a goal that is measurable and is important to you. Will you be able to watch netflix if you are consumed by your goal day and night? If your thoughts are fooling you,then you will get discouraged by every small failure. I think it helps to be less emotional and mechanical in the pursuit of a goal.