The gradual spiritual and moral development of Muslims was the wisdom behind the

The gradual spiritual and moral development of Muslims was the wisdom behind the piecemeal revelation of the Glorious Qur’an. The Glorious Qur’an is the holy book of Islam, and it contains the revelations that were received by Prophet Muhammad (peace be upon him) over a period of 23 years. These revelations were not revealed all at once but were revealed gradually, in stages, and in response to the circumstances and challenges that the Muslim community was facing at the time. This gradual revelation allowed the Muslims to receive guidance and teachings that were appropriate to their level of understanding and spiritual development. The Qur’an also contains a wealth of guidance on ethical, social, and spiritual issues, which helped Muslims to develop their moral and spiritual character gradually. So, the correct answer is "piecemeal revelation of the Glorious Qur’an."