'Brahma satyam jagat mithya, jivo brahmaiva naparah—"Brahman is the only truth, the world is unreal, and there is ultimately no difference between Brahman and individual self'-Adi Sankara in Viveka Chudamani
Declared Adi Sankara, the greatest exponent of non Dualism or Advaita,
Knowledge is relative,There are two kinds of Knowledge.
One is Para Vidya which id Eternal and another is Apara Vidya, that is transitory, that is of this temporal world.
From the Absolute stand point the knowledge we have here in this world, including Science et al is only Real till Real Knowledge dawns.
Then it becomes Illusory.
So the word is real and Unreal or Illusion , both at the same time.
Hinduism speaks of fourteen levels of existence.
Eleven have been proved theoretically by Quantum Physics.
