That is, if you talk about the thoughts creating the desire. In a study of 112 adults with rheumatoid arthritis or chronic asthma, doctors asked two thirds of the group to write about a very upsetting event in their lives for 20 minutes a day, three days in a row. The remainder just wrote about their plans for the day. At checkups two weeks, two months, and four months later, almost half of those who'd written about a traumatic experience had marked improvements in their asthma or arthritis - whereas over half the others had no change at all. Trauma may produce hormone changes that affect long-term health and writing about it may help restore balance.
Writing is talk therapy.
Writing out or talking aloud to yourself about what has upset you and how you feel about it is a valuable self-help tool, if you can do so without becoming so emotionally upset you lose control. You do not know or are fearful of facing what upsets you. The thoughts and beliefs fueling desire are subconscious thoughts and beliefs. Positive thought at the conscious level only is like riding half an ass. It will not get you where you are trying to go.