Muhammad son of Abdullah (S) was one of the great and most distinguished among them and is a prophet of Muslims. When he was appointed for his prophethood, due to the continuous and prolonged hardships and the painful endeavors of past prophets, the religious learning level of human being reached to the point whereby they were in a position to receive the best and most perfected laws and could comprehend the highest leanings; they should guard forever the trust of knowledge of all prophets, then the Prophet of Islam was appointed and he presented the most complete program and comprehensive commandments for the human beings.
If the commandments of Islam been implemented, the prosperity of the world and hereafter would have been assured as they were sufficient for guidance of humanity during the period of the Holy Prophet (S); likewise they are sufficient for the prosperity of the present period as well as for more progressive forthcoming generations.
Everyone who would conduct research with accuracy and precision regarding Islamic commandments and learning and would compare them with other commandments; the distinction of Islamic commandments would become explicitly clear upon him. And it was because of this reason that he is the last prophet and after him no prophet would come. The matter of being the Seal of the Prophets for Muhammad (S) is a necessary requirement and whoever denies it would not be considered as a Muslim.