The historical impact of the six meditations has been divided. The first two meditations, which employed the skeptical methodic doubt and concluded that only the ego and its thoughts are indubitable, have had a huge impact in the history of philosophy. They are often considered as epoch-making for modernity, and an unavoidable first step for any modern philosophical thinking. The remaining four, which attempt to overcome skepticism and prove the existence of God, have been of lesser interest.
Edmund Husserl, founder of phenomenology and a strong influence on 20th Century European philosophy, argued that the first two meditations are the only part of Descartes's work with any philosophical importance at all.