Almost all of you have heard of the word Maya. Generally it is used, though incorrectly, to denote illusion, or delusion, or some such thing. But the theory of Maya forms one of the pillars upon which the Vedanta rests; it is, therefore, necessary that it should be properly understood.
Source, in full
in Vivekananda: the yogas and other works, including the Chicago addresses, Jnāna-yoga, Bhakti-yoga, Karma-yoga, Rāja-yoga, Inspired talks, and lectures, poems and letters. Chosen and with a biography by Swami Nikhilānanda, p. 219.