Sigmund Freud wrote a lot about sex but he also made one observation that is relevant to business: the energy of the id can be discharged either by doing or by fantasising.
Modern bookstores are full of pap offering shortcuts to wealth and success through positive visualisation. They are porn for your ambition. Do not buy them.
Recent academic work by Gabrielle Oettingen outlines that positive visualisation decreases the likelihood of you achieving what you are visualising. The act of dreaming discharges ambition. A central part of the success fantasy is to mentally airbrush the work needed to get there.
Irrational positive thinking encourages half-hearted steps toward unobtainable goals and diverts personal resources away from what is achievable.
Oettingen describes the act of dreaming of success in isolation as indulging. She talks about mental contrasting, in which subjects consider their ambitions then their present situation and the obstacles between them. This forces a focus on what is obtainable and channels efforts into productive activities.