Descartes' Meditations on First Philosophy

Descartes' *Meditations on First Philosophy* is a philosophical work where he questions what we can truly know. He begins by doubting everything, including senses and memories, to find something certain. He concludes that while doubting, he must exist — summarized in the phrase "I think, therefore I am." From this foundation, he explores the nature of the mind, body, and God, aiming to establish a secure basis for knowledge. The work is a pursuit of clear, indubitable truths and understanding the relationship between thought, existence, and reality.