It is incumbent upon God that for the admonishment and guidance of human beings, He should appoint messengers and necessary commandments and laws should be provided to them.
Reason of this Matter
The purpose of creation of the human being is not only limited so that he should live in the world, utilize divine bounties and with thousands of efforts and endeavors, tolerance of different sorts of hardships; that he should complete the short and limited portion of his age and then die and disintegrate. If it is so then the creation of human beings and the world would be nonsense and void and the sacred threshold of God, the Wise, is glorified from undertaking nonsense and void acts.1
Instead the human being has been created with the intention of being higher and the most exalted one in the creation of existence. God has created human beings in order to learn distinctions and perfections of humanity in order to acquire the decency and worthiness that he should be able to achieve ranks, positions, and rewards in the hereafter.
Therefore a human being is needy for a complete program, commandments, and laws that one side should organize his worldly life and should prevent from transgressions and threats upon him through assuring his freedom, comfort, and rights. While on the other side should provide him the path of human perfection, straight path, honesty, and return to God and should teach his perfections and distinctions of his self, make him aware of evil conducts and deviated factors; but the short and limited faculty of reason of a human being is unable to create such complete commandments and provide to a nation because
Firstly: knowledge and information of human beings is limited and incomplete, it does not have sufficient information regarding different sort of needs of human beings, dimensions of good and evil, and how to encounter with limitations and laws.
To prove the correctness of this statement that human being from birth until, now has endeavored to create complete laws for the management of the society, plenty of hardships have been done in this path and a significant amount of budget has been spent but until now has not been able to obtain desired laws. Every day he passes a law but it does not take very long that he discovers its defects, and therefore either decides overall to void it or through ratification of a note tries to reform it.
Secondly: The motivation of self-interest and egotism of human legislatures never permits them to close their eyes from their own interest as well as the interest of their associates and to look at all human beings with the same scale, or to consider the interests and benefits of a general people. And whenever they decide to disregard their self-interests and prejudice and do it for the sake of pretending, eventually this stubborn nature dominates upon them and whether intentionally or unintentionally forces them to follow the path of their own selfish interests.
Thirdly: human legislatures are ignorant of spiritual perfections and virtues and do not have any information regarding spiritual life; they do not consider the prosperity of human beings except through the dimensions of material means; while the worldly life of a human being is not separate from his spiritual life and a very profound relation exists between them.
It is only the Creator of men and worlds Who encompasses all dimensions of good and bad for the human being and knows well the path of perfection and prohibition from dangers. He is able to provide commandments and laws which assure the prosperity of world as well as of the hereafter for a human being. It is because of this reason that we could say: A wise God never releases a human being in the valley of distress and ignorance; instead his infinite benevolence requires that through means of his appointed messengers from the race of human beings, to provide them required commandments and a program.
The messengers are distinguished appointed persons who are in a position to establish communications with the God of worlds and could receive realities; and could declare to the people accordingly, such type of communication is called a revelation that is unique and a special communication which is established between His messengers and God. A messenger through the means of esoteric eyes witnesses the realities of the world of existence, with his heart’s ears hears words from the unseen and announces them to the people accordingly.