Acharya Prashant explains that human beings can simultaneously live in two different worlds: the world of reality, which is the present moment, and the world of the mind, which is composed of imagination and thought. He defines the mind as the combination of the brain and intelligence. The brain is described as a material, mechanical device similar to a computer hard disk or a fan, functioning as a product of evolution and a slave to external commands. It possesses a memory chip that registers experiences, leading to conditioning. Conditioning is the permanent deformation or residue left on the mind by past experiences, whereas mere knowledge is the recollection of data from the past without that permanent psychological scar.