ADNAN OKTAR: The Prophet (saas) says: "Know that Mahdi is the inheritor of all knowledge. He is knowledgeable in all fields of science." (Najm us Saqib, p.193) Of course by science, that is knowledge, it is not referred to scientific information that is usually memorized, or learnt knowledge. The term ‘science’ or ‘knowledge’ here is entirely different; that is the particular knowledge God inspires in the heart. Ilm Al-Ledun (Secret Knowledge) emerges as a strategy in safeguarding the believers against extraordinary phenomena. In fact, the reason the Surah al-Kahf is conveyed through secret knowledge is that Mahdi (as), too, will be the master of secret knowledge. Mahdi (as) acts only through the means of Ilm al-Ledun (secret knowledge). He couldn’t carry out his duty as the Mahdi without it. This is why it is impossible to understand Mahdi (as) by only looking at his appearance. Secret knowledge is the main reason among the reason of his ‘seventy curtains.’ Those curtains come about through secret knowledge.
Excerpt from Mr. Adnan Oktar's Live Conversation on A9TV dated March 4th, 2017