If the past and the future do not exist, why do people worry about them?

Question from Y! Answers: Past is gone, future is not here yet; if it ever gets here, yet many people's lives are controlled by these two nonexistent forces...

My Answer:

Humans have 3 main energy channels: left (past), central (present) and future (right). The stresses of mundane life accumulate as blockages or disturbances in these subtle energy flows.

Thoughts in the brain come from the left (past) and right (future) constantly. There is almost no way to stop them, as they are innate part of human existence. Spiritual masters who know meditation are able to soothe their left and right channels and stay on the central channel, which results in these thoughts from past/future subsiding.

Eventually the person is able to experience freedom from these annoyances. Check out the references below for more info. Or try a simple meditation exercise here: Meditation Basic Excercise

Source(s):

ResearchingMeditation.org
Left & Right Channels