A combination of both Mithya (false beliefs and false mental and emotional conditioning) and maya (ignorance of truth) creates all non-truths or illusions. Wherever there is Mithya, maya or ignorance of the truth follows. Ignorance of the truth always follows false beliefs and false mental and emotional conditioning.
"satya or satyam. It is not merely truthfulness, but that singular Truth that can never be untrue at any time, place, or circumstance. Non-dual Truth transcends, time, space, and causation. Note, that time and space create divisions. If something transcends time and space it has no limits or boundaries. Therefore, this Truth/Reality must be infinite, eternal, and indivisible, hence, all-pervading. Further, there cannot be two infinites. Thus Brahman is all there is. So what is this world?
The statement above says it is mithya, false. But what does this false mean? It means changing, impermanent, perishable, superimposed, and dependent on something else for its existence. Another great statement from the Upanisads asserts, Sarvam khalvidam Brahman, All this, indeed, is Brahman. All this (idam), meaning that all we see with our mind and senses is Brahman, but we are not recognizing it as Brahman. And this is maya, ignorance, the cause of all suffering.That one, the Eternal among non-eternals, the Intelligence of the intelligent, who though ever one fulfills the desires of the many those who realize that One as existing in their own self, to them belongs eternal peace, and to none else.
Shining like burnished gold in the luminous sheath of intelligence, the deepest core of the human being, there dwells Brahman, stainless, indivisible, and pure. That is the Light of all that shines. That is what the knowers of the Self realize."
http://www.advaita-academy.org/blogs/brahman-satya/