Acharya Prashant explains that people are often obsessed with the concept of death because of fear and the ego's dread of annihilation. He questions why death is considered more important than the immediate moments of life, such as drinking tea or breathing. He argues that if one does not understand the simple facts of existence and the workings of their own mind, they cannot hope to understand death. The speaker emphasizes that the same mind that is confused about marriage, money, and daily life is the one trying to grasp death; therefore, the focus should be on cleaning the 'mirror' of the mind to see everything clearly as it is.