In acquiring one’s conception of the world one alwaysbelongs to a particular grouping which is that of all the socialelements which share the same mode of thinking and acting. Weare all conformists of some conformism or other, always man-in-the-mass or collective man. The question is this: of what historicaltype is the conformism, the mass humanity to which one belongs?When one’s conception of the world is not critical and coherentbut disjointed and episodic, one belongs simultaneously to amultiplicity of mass human groups. The personality is strangelycomposite: it contains Stone Age elements and principles of amore advanced science, prejudices from all past phases of historyat the local level and intuitions of a future philosophy which willbe that of a human race united the world over. To criticise one’sown conception of the world means therefore to make it acoherent unity and to raise it to the level reached by the mostadvanced thought in the world. It therefore also means criticism ofall previous philosophy, in so far as this has left stratified depositsin popular philosophy. The starting-point of critical elaboration isthe consciousness of what one really is, and is “knowing thyself”as a product of the historical process to date which has depositedin you an infinity of traces, without leaving an inventory. The firstthing to do is to make such an inventory (QdC, pgg 627ff)
A more articulate expression can be found here.