Source - mawlana.shaykh.nazim
Grandshaykh AbdAllah (qs) told me about Ka`b al-Ahbar, the most learned man among Jews living in Hijaz in the time of the Prophetﷺ. Because of his great learning, Ka`b expected the coming of the Last Prophetﷺ whose appearance he found foretold in the Scriptures. Ka`b's knowledge was so extensive that he had reached the 'Station of Gabriel', but not beyond.
According to Grandshaykh, knowledge is divided into two parts: one part extends from the Earth to the Station of Gabriel (a). The Sons of Adam may learn this knowledge through their intellectual efforts. The other part extends upward from the Station of Gabriel, the Archangel who represents intelligence, and intellectual knowledge reaches up to his station.
However, after that station are oceans of strange and wonderful knowledge beyond the boundaries of the mind and intellect. The mind is not capable of balancing those oceans of knowledge and when confronted with them can only say, "No further can I go, I have reached my limit."
Technologically-learned people are floundering and struggling unsuccessfully to arrive at a complete understanding of the Creation through empirical knowledge: they want to be able to see everything in front of their two eyes and analyze it by their five senses, and anything outside of the perception of their senses is rejected. Whosoever says that knowledge is limited to what the five senses can observe and does not accept any other type of knowledge is a fool, for you can never limit knowledge!
Sultan al-Awliya Mawlana Shaykh Nazim Adil