That there never was any philosophy: that's what he is trying to show. That what appeared, from the first, to be philosophy, was not, in fact, philosophy.
His task: to show that philosophy, in its entirety, was poorly founded. That philosophy, from the first, got off to a poor start, and never corrected that start.
His task: to gently suffocate philosophy. To let it die without fuss. To let philosophy fall into death as into sleep. Go to sleep, philosophy, he will say, as he closes its eyes. Go to sleep.
And when his task is done? When philosophy has sunk to the ground, knees buckling, when it has breathed its last breath? Then it will be the turn of him, too, to sink to the ground, for his knees to buckle. Then it will be time for his last breath.
Go to sleep, he will say to philosophy, gently closing its eyes. Go to sleep, God will say to him, and gently close his eyes.
He will be the last philosopher, if he accomplishes his work, he says. Philosophy will die with him, when he dies, if he is able to finish his work.
He will place the chloroformed rag over the face of philosophy. And then God will place the chloroformed rag over his face.
His own death: that's where his work will end. His own extinction.
The death of philosophy. His death.