Language is an important method for the transfer of experiences and the understanding of the teachers and the influence of others. The letter reveals the characteristics of the text and its meanings, and shows the extent of the influence of language and the level of harmony of the unit studied language. The approach of rhetoric as one of the religious books, has a high literary value including a number of speeches, The study examines the original and subsidiary functions and how they are linked by the mechanisms and tools of harmony and consistency. The results refer to the relationship between the father and the son in the knowledge of the belief in the description of those who desire the religion and then draw the road and wanted by his son where he goes to the right of death and readiness and moral knowledge is concerned with the removal of despair and disappointment of the address and repentance to punish the punishment of God more than prove his forgiveness. In these great tips, influence on the interlocutor and the abundance of tools Harmony refers to the interest of the Imam (p) in knowledge and influence on his speech. The approach followed by the research is the descriptive-analytical approach.