The four agreements© were published in 1997 and have sold about 9 million times. He has been on the New York Times bestseller list for nearly a decade. Everything we do is based on agreements we have made – agreements with ourselves, with other people, with God, with life. But the most important agreements are those we make with ourselves. The fourth agreement allows readers to have a better understanding of the progress made in achieving their goals in life. This agreement involves the integration of the first three agreements into daily life and the exploitation of its own potential.  It is a matter of doing the best that can be managed individually, which varies from the different situations and circumstances that the individual may encounter. Ruiz believes that if you judge yourself and do your best at all times, you will be able to avoid remorse.  By integrating the first three chords and doing the best in all facets of life, the individual will be able to lead a life without grief or self-awareness.  What images did the others project on you? When you say, „I`m smart, I`m stupid, I`m beautiful, I`m ugly,“ these images are just knowledge or a lot of concepts.
You unfold an image of perfection, a picture of what you should be to be good enough, but you don`t match that image. Of course, what your mother tells you is not exactly what your father tells you you are, or what your brothers and sisters, TV, church or the whole company tells you it`s you. Every person in your life projects a completely different image from you, and none of these images are accurate. In addition to demhur`s book and book, there is also an eBook, a four-colour picture book, a card game and an online course.  After years and years of trying to please other people`s images of what you should be, after trying to find out who you really are, you finally give up and accept other people`s images of who you are. But there is something in you that aspires to be free; It always tells you, „That`s not who I really am. That is not what I really want. You are not free to be who you really are because you are trapped by images that you think you are. The book is based on a series of spiritual beliefs, held by Toltec`s seniors, to help readers transform their lives into a new experience of freedom, happiness and love.  According to the author, everything a man does is based on agreements he has made with himself, with others, with God and with life itself.  In these agreements, we can tell ourselves who they are, how to behave, what is possible and what is impossible.  Some agreements that create individuals may not cause problems, but there are certain arrangements that come from a place of fear and have the power to deplete emotional energy and reduce a person`s self-esteem.
 The book states that these self-limiting agreements cause unnecessary suffering.  Ruiz also believes that to find personal joy, one must get rid of socially imposed and fear-based agreements that can unconsciously influence the individual`s behaviour and thinking.  Another fundamental premise of the book suggests that much of the suffering is created and that most people have the ability to transform themselves and the negative thoughts they have about the situations in their lives.  The author identifies the sources of unhappiness in life and proposes four beneficial agreements that can be concluded with oneself to improve their general state of well-being.