After years of thinking and furious combat, René finaly found a thought they could not refute or destroy, an idea that was a celebration of mankind and honoured the greatness of the human spirit.
'I think, therefore I am,' he told them.
The sceptics were baffled and they discussed it feverishly between them. Then they started laughing.
'What?' said René.
They looked up and smiled. 'Define "I",' they said.