Divine grace
According to Henry Corbin, the oldest traditions that form the basis of Islamic prophetology come from the teachings of the Shia Imams, and Shia milieu was propitious for the rise, study and development of this scholastic field. He holds that "divine science" is not an ordinary science, impossible to communicate in the conventional manner, except by a prophet. The circumstances of this communication is the object of Islamic prophetology. According to the Ayatollah Ja'far Sobhani, prophets are the medium for the flow of Divine grace to humans who have been sent down by God since first humans had deserved it until the time of Muhammad prophet of Islam.