The First Principle of All Knowledge for Descartes

"I don't think we worked through the argument conversationally. You touched up tpage 20, but 14, substantively was about as much meat on the bone." "The supreme principle of knowledge is going to be self consciousness," he says. 'It's the only thing that we can know with complete certainty' But how do we get back objectivity in a satisfying way? He asks.