In The Name of God, The Most Merciful, The Especially Merciful
“[All] praise is [due] to God , who has sent down upon His Servant the Book and allowed no crookedness in it.”
Indeed the book is a gift to The Messenger (Peace Be Upon Him) and a gift to the Mankind. As for being a gift to Him (Peace Be Upon Him), this is because through the book God (Exalted is He) has informed him of the secrets of the knowledge of Tawhīd (Oneness of God), His Tanzīh (transcendence), His Sifāt (attributes), the hidden states of the His angels, the Prophets, the meanings behind Qadhā and Qadar (Divine judgement and Predestination), the connection between the different heavens, the connection between this world and the world to come, the manner in which predestination descends from the unseen world, the manner in which the spiritual and material world are connected, and so forth. There can be no doubt that these matters are from the greatest gifts.
As for the book being a gift to Mankind, this is because it expounds upon matters relating to religious obligation, divine promise and chastisement, and reward and retribution. In summary, it is a complete book of the highest level such that everyone is able to pick from its tree, according to the strength of their intellect. Therefore, it is incumbent upon The Messenger of God (Peace Be Upon Him) and Mankind that they praise God (Exalted is He) for the gift of the Qur’ān.
And only God knows best.