In his "Meditations on First Philosophy," René Descartes tried to answer that very question, demolishing all his preconceived notions and opinions to begin again from the foundations.
Oma "Mõtisklustes Esimesest Filosoofiast" üritas René Descartes  sellele küsimusele vastata tehes maatasa kõik oma senised teadmised ja arvamused et alustada algusest.