A classic book in the self-improvement field that essentially opened new horizons for what we mean by self-improvement. The whole book is based on the following simple logic: Man is not a machine but has a machine at his disposal. His mind. By using the same principles we encounter in the use of machines, and mainly with the basic tool of the mind that only humans have, that is, the use of imagination, one can reprogram their mind to function based on success, rather than failure, based on expansion, rather than self-destruction. And all this can be achieved when a person reconstructs their self-image based on new beliefs and positive experiences stored in their memory.