“There is only one agreement left, but it is one that allows the other three to become entrenched habits. The fourth agreement is about the action of the first three: always do your best. “The first agreement is the most important and the most difficult to respect. It is so important that with this first agreement, you will be able to reach the level of existence that I call heaven on earth. The first agreement is to be blameless with your word. 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.  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.” Ruiz describes a sin as all that goes against himself, and therefore to be impeccable with language is to assume the responsibility of one and without judgment against oneself and against the other.  This agreement focuses primarily on the importance of speaking with integrity and carefully choosing the words before saying it out loud.  The word is so powerful that a word can change a life or destroy the lives of millions of people.