How do we know? EvG 1996

In 1996 Ernst von Glasersfeld wrote:

• The concept of knowledge is thus actually changing. Traditional philosophy was forever searching for timeless truths that would be independent of the thinking subject. With the spreading of the Kantian insight that what we rationally grasp is always what human reason builds up according to its own rules, interest has been growing in how this building-up proceeds. And this is the area in which we celebrate Heinz von Foerster as a pioneer. 
• There can be no final answers in this area but only models that, for the time being, satisfy our demands. Hence he reminds us that the responsibility for the world we conceptually construct and enact rests with us.
• Farewell to objectivity (Revised and expanded English version of 136) . Systems Research 13(3): 279–286.