Since man’s knowledge and understanding is limited only to the tangible world in which he lives, there is no need for him to comprehend the unseen world; except in matters that would lead him to knowing the greatness of his Creator and bring closer to His pleasure and reward. For this reason, Allah, the Exalted, sent Messengers to mankind continuously and He gave them knowledge of the unseen world such that the goodness of man could be attained. If the human intellect is unable to realize what occurs in the next room, then by extension, it would not be able to comprehend the unseen world.