Cogito, ergo sum (See CSMK III 159, 161.) Another predecessor was Avicenna's "Floating Man" thought experiment on human self-awareness and self-consciousness. The 8th century Hindu philosopher Adi Shankara wrote in a similar fashion, No one thinks, 'I am not', arguing that one's existence cannot be doubted, as there must be someone there to doubt. The central idea of "cogito, ergo sum" is also the topic of Mandukya Upanishad. Spanish philosopher Gómez Pereira in his 1554 work "De Inmortalitate Animae", published in 1749, wrote ""nosco me aliquid noscere, & quidquid noscit, est, ergo ego sum"" ("I know that I know something, anyone who knows
Mr. Cogito Laments On The Pettiness of Dreams"), "Pan Cogito a poeta w pewnym wieku" ("Mr. Cogito And A Poet Of A Certain Age"), "Pan Cogito a pop" ("Mr Cogito And Pop Music"), "Pan Cogito o magii" ("Mr. Cogito On Magic"), "Pan Cogito spotyka w Luwrze posążek Wielkiej Matki" ("Mr. Cogito Encounters A Figurine Of The Great Mother In The Louvre"), "Pan Cogito opowiada o kuszeniu Spinozy" ("Mr. Cogito Narrates The Temptation Of Spinoza"), "Pan Cogito otrzymuje czasem dziwne listy" ("Mr Cogito Occasionally Receives Strange Letters"), "Rozmyślania Pana Cogito o odkupieniu" ("Mr Cogito's Meditations On Redemption"), "Pan Cogito szuka rady" ("Mr. Cogito