Even if a situation seems so personal, even if others insult you directly, it has nothing to do with you. What they say, what they do, and the opinions they give correspond to the agreements they have in their own minds… If you take things in person, you make easy prey for these predators, the black magicians. They can easily associate you with a small opinion and feed you, whatever they want, and because you take it personally, you eat it on… 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. By pacting with these four most important chords, an individual is able to dramatically influence the amount of happiness he feels in his life, regardless of external circumstances.  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.  Ruiz explains that this agreement is certainly the most important, but that the most difficult thing is to respect it.  For this agreement, Ruiz first analyzes the word “irreprocible.” The perfectly irreproachable word comes from the Latin word peccatus, which means “sin,” and the term “im” at the beginning of blame is the Latin prefix meaning “without.”