Let us have another careful look at these descriptions...
Let us have another careful look at these descriptions, to find out that what motivates the messenger to illustrate main lines of that divine system under leadership of his holiness, and give such a picture of Hazrat Mahdi' s personality years before his birth and centuries before his return.
Inspiring hope and willing among generations, preparing them to stand the hard time of absence, along with giving correct understanding of this hard time and finally putting constant and steady efforts in fulfillment of that bright future, can be the main objective that stimulated the Messenger to give these messages.
If we do not assume this, then why the messenger gives such detailed account of Imam Mahdi and future world, when there were only 3 of our innocent Imams in life (Aniir ul Momenin, Imam Hassan and Imam Hossein). A world, in which ignorance and wisdom will not be considered the same. Wise people shall not be mixed with Ignorants, and hence they can be easily recognized. Where, Imam Mahdi using his divine insight will clearly distinguish between these two groups.
His revolution, in accordance with a clear and self explanatory historic movement has been commented as a step during human civilization periods. He fulfils the promises that preceding messengers made, and his mission will be to put previous messenger's efforts into effect. This honorable Imam is introduced a as symbol of divine knowledge and power.
The knowledge brings him an extraordinary insight and his blessed power puts him in a position that allows no one to prevent him from achieving goals of this divine plan. If this holy revolution does not take place, creation may seem imperfect and in vain, and the deceptive question may touches the minds that whether the intention of life was to watch generations coming and leaving, or to witness tyranny, cruelty, bloodshed, and lootings by different governors of the history?
In reply to this misleading question, the Almighty God equips his strong leader, with wisdom and power, to rule the world. God will assist him to help the oppressed people, and fight infidelity and unbelief; He will support him in respecting martyrs blood, revenging on the tyrant, and finally God guides him to take control of unstable ship of humanity. He will lead the mankind to their destination, where, we should wish to be blessed with the chance to witness.