"Cogito, Ergo Sum" is a philosophical book by the famous English writer John Foster West, in which the author examines the issue of existence, consciousness and the role of thinking in human life. In his book, West combines philosophical thought with modern scientific discoveries to explore the essence of human thinking and awareness of one's existence. Taking a journey into the depths of consciousness, the author invites the reader to think about what the phrase "Cogito, ergo sum" really means (translated from Latin as "I think, therefore I exist") and what significance it has for our understanding of the world. The book "Cogito, Ergo Sum" encourages philosophical reflection and advances the reader through self-discovery and reflection.