The key words here are "present moment." Worry, then, is a technique you have created in order to use up the "now" moments of your life, rather than choosing to use these precious, present moments living a fully functioning, happy life.
Everything that has ever happened to you did not happen in the past—it happened in the present moment. And everything that will ever happen to you will not occur in the future—it will take place in the "now" as well. So every moment you elect to spend in worry is your way of using up your "nows" by not being fully present in your life.
Your worry list can be long indeed: your health, your family, the economy, your security, your job, etc. All of it is a means for you to occupy your mind here and now as an excuse to avoid living. A worrier sits around and thinks about things and remains inactive, while a doer refuses to occupy the precious, present moments of his/her life and sets aside futile mental activity.
Think back to all the things you worried about 15 years ago. How did that worry impact the outcomes that have become your very life? Now examine all of the things you worry about today and remind yourself that in 15 years, all you will have done with your worry-mind is avoided living fully in your present moments.
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