1. The need from the point of view of teaching
If we ride upon a fantastic and fairy tale-like horse which is built of rays of light and in every second we travel 300,000 kilometers in the shoreless space, doubtlessly we will need to have thousands of life-times of Noah just to see a small part of this extensive universe. It is clear that this universe, with its greatness, was not created uselessly and as we learned in our study of God, the creation of this world has no benefit to God’s state, because He is a Being Who is totally and absolutely free from any need, Who is eternal and He has no deficiency which He could want to meet by the creation of the world and humanity.
Thus, we can conclude that His goal was to give Mercy to others and to help creatures reach perfection, just like the fact that the sun shines upon us without it having any need of us. This light and heat of the sun is only to our advantage and benefit because what do we do for the sun?
On the other hand, is our intelligence and knowledge sufficient for us to move along towards the way of perfection and the reaching towards becoming a perfect human being?
What amount of the secrets of the world do we know?
What is the truth of life?
When was this world created? No one knows the answer to these questions.
How long will it remain? Again, no one knows the answer to this.
Every scholar of humanity has an opinion from the social and economic point of view. For instance, one group recommends capitalism and another group, socialism or communism and another group, neither accepts this group nor that, and considers both to be harmful.
In other issues of life, as well, there are differences of opinions among the scholars. A human being falls into a state of wonder as to which one of all of these to accept. It is here that, in all fairness, we must admit that in order to reach the main goal of creation, that is, perfection and nourishment of the human being in all areas, we need a series of teachings which are correct and empty of any error; ones which rely upon the realities of life, teachings which can help us, upon this long road, to reach the main goal.
This can only be done through God’s knowledge, that is, divine revelation through the prophets. Because of this, God Who created us to take this journey, must place the knowledge at our disposal.
2. The need for leadership in the social and moral areas
We know that within our being, in addition to knowledge and wisdom, other motives called ‘instincts’ also exist, the instinct of self-love, the instinct of anger and harshness, the instinct of lust and multiple other instincts. Without doubt, if we do not control our instincts, and they dominate over us, even our knowledge and intellect will be imprisoned, and the human being, like the oppressors of history, will be changed into wolves which are far more dangerous than the wolf of the wilderness.
We need a teacher to learn ethics. We need a model so that we can learn from him according to the principle whereby one narrates something and others follow. A perfect and disciplined human being, from every point of view, is required to take our hand upon this way, which is full of twists and turns, and prevent the rebellion of our instincts, to have virtuous principles and his deeds and words sit upon our hearts and very beings, nurture courage, bravery, friendship with other human beings, brotherhood, forgiveness, loyalty, correctness, trustworthiness and purity within our spirits.
What person, other than a pure and immaculate prophet, could be chosen to be such a teacher and guide?
For this very reason, it is not possible that God not show His Mercy to us and prevent us from the existence of such leaders and teachers.
Ref: Fifty Lessons of Principles of Belief for Youths; Ayt. Makarem Shirazi; Translated by: Bahador Shirazian; Published by: Ahlul Bayt World Assembly