What is the religious miraculousness of the number 40 mentioned in the Qur’an and Sunnah, and its relationship to the beginning of the prophetic message and the revelation of the divine inspiration?

The religion of Islam contains a miraculous quality that astonishes minds. It is incumbent upon the specialized Muslim to ponder the texts of revelation and to objectively present them to the intellect, comparing them with others, in order to discover the miraculousness within their various domains. The number "40" is mentioned four times in the Qur'an and frequently in the Sunnah, such as the descent of revelation upon the Prophet, peace and blessings be upon him, after the age of forty. It cannot be claimed that forty, to the exclusion of other numbers, possesses a miraculous quality, nor can this be denied except with clear scientific proof.