Hazrat Mahdi (as) will show people the true path of the Qur'an and the Sunnah of our Prophet (saas)

From Nahj al-Balaghah: The lord of believers (saas) said: "They followed the wrong paths and went to the right and left, abandoning their guiding traditions...O people, this is the time when all promises will come true, when THE COMING OF ONE UNKNOWN TO YOU [HAZRAT MAHDI (AS)] IS CLOSE AT HAND.  Note that he who has emerged from among you [HAZRAT MAHDI (AS)] WILL OVERTAKE THEM WITH A BRIGHT LIGHT IN THESE MOST DIFFICULT TIMES... (Bihar al-Anwar, Vol. 51, p. 186)

In this hadith narrated from our Prophet (saas) it is revealed that with the coming of Hazrat Mahdi (as), people will be enlightened by a radiance and reason stemming from the Qur’an, and that Hazrat Mahdi (as) will show people Allah’s true path, the beauties of the Qur’an and the Sunnah of the Messenger of Allah (saas).

(Our Prophet’s (saas) reference to “A BRIGHT LIGHT”is also suggestive of the TELEVISION AND COMPUTER SCREENthat Hazrat Mahdi (as) and his followers will use.)