How to understand the Mechanics of the Mind?

The mind is constantly conversing with itself - replaying past events , re-arranging them into a better drama , planning for the future , discussing the pros and cons of this and that .By methodically slowing down its continuous ramblings , the internal dialogue , and focussing on positive and uplifting objects , it is possible to begin to understand the mechanics of the psyche and bring about a more effective life .

Swami Vishnu devananda from the book "Meditation & Mantras" pg .2