Book Notes
The Power of Your Subconscious Mind by Joseph Murphy (revised by Ian McMahan) — review and summary
The Power of Your Subconscious Mind is a mid-century self-development classic. Its framework is dated in some respects and genuinely useful in others — the useful parts are about how automatic patterns form and how to change them.
Joseph Murphy was a New Thought writer and minister who published The Power of Your Subconscious Mind in 1963. It has remained in print for over sixty years and has sold tens of millions of copies. Ian McMahan's revised edition updates some of the language and context without substantially changing the original framework.
The framework
Murphy's central argument is that the subconscious mind does not distinguish between actual experience and vividly imagined experience. What is consistently held in the conscious mind, he argues, is eventually accepted by the subconscious as real and acted upon accordingly.
This has several practical implications in his account. Habitual negative self-talk and expectation tends to be realised in behaviour and outcome, not through mystical causation but because the patterns that operate automatically — the subconscious patterns — are shaped by what is repeatedly presented to them. Conversely, positive expectation and mental rehearsal tend to shape automatic behaviour in productive directions.
What is credible here
Stripped of its more metaphysical framing, the core argument overlaps significantly with modern research on implicit learning, behavioural rehearsal, and the formation of automatic responses. The idea that what you practise mentally shapes what you do automatically is not controversial; it is the basis of visualisation techniques used in sports psychology.
The argument that habitual self-talk shapes expectation and behaviour is also supported by research on self-efficacy and the relationship between internal narratives and performance.
What requires caution
Murphy writes in a tradition that sometimes implies direct causal power of thought over external circumstances in ways that go beyond what evidence supports. The claim that the subconscious mind can directly influence health outcomes or external circumstances through thought alone is not established.
The practical value of the book is in its application to behaviour and internal states, not in its more expansive metaphysical claims.
Historical context
The book was written in 1963 and its cultural context is visible throughout. The language of mind and subconscious reflects the popular psychology of its era rather than contemporary cognitive science. Some of the examples and illustrations are dated.
The revised edition by McMahan updates some of this but cannot fully modernise a framework written in a very different intellectual context.
Who this book is for
The Power of Your Subconscious Mind is most useful for readers who are drawn to the New Thought tradition and want the classic primary text, or for readers interested in the history of popular self-development writing.
For readers primarily interested in the science of habit formation and automatic behaviour, more recent books grounded in cognitive research — including Charles Duhigg's The Power of Habit and James Clear's Atomic Habits — cover the same practical territory with more rigorous foundations.
The habits page on this site provides a current-evidence summary of habit formation.
Practical reflection prompts:
- What automatic patterns are operating in your professional or personal life that you did not consciously choose?
- What is the difference between positive expectation and wishful thinking?
Bibliographic details
- Original author: Joseph Murphy
- Revised by: Ian McMahan
- Originally published: 1963
- Revised edition: 2009 (Penguin)