Skepticism

Skepticism is a philosophy that is generally a questioning attitude or doubt towards a piratical belief or set of beliefs, to the ability to gain knowledge in a particular field of study, or, in the case of total skepticism, towards the possibility of gaining any knowledge at all.

Reading
Stanord Encylopida of Phislopshy on Skeptism

Meditation on First Philosphy by Rene Descartes