Man alone is responsible for his thinking - EvG 1984

In 1984 Ernst von Glasersfeld wrote:

• "Indeed, one need not enter very far into constructivist thought to realize that it inevitably leads to the contention that man – and man alone – is responsible for his thinking, his knowledge and, therefore, also for what he does."
• "Today, when behaviorists are still intent on pushing all responsibility into the environment, and sociobiologists are trying to place much of it into genes, a doctrine may well seem uncomfortable if it suggests that we have no one but ourselves to thank for the world in which we appear to be living. (p. 17)
  
• "An introduction to radical constructivism" , in P. Watzlawick (ed.) The invented reality. New York: Norton 1984: 17–40.