“A philosopher should not be afraid of scepticism, but should go on bruising his jaw. Perhaps the failure of metaphysics lies in the caution and timidity of metaphysicians, who seem ostensibly so brave. They have sought for rest—which they describe as the highest boon. Whereas they should have valued more than anything restlessness, aimlessness, even purposelessness. How can you tell when the partition will be removed? Perhaps at the very moment when man ceased his painful pursuit, settled all his questions and rested on his laurels, inert, he could with one strong push have swept through the pernicious fence which separated him from the unknowable. There is no need for man to move according to a carefully-considered plan. This is a purely aesthetic demand which need not bind us. Let man senselessly and deliriously knock his head against the wall—if the wall go down at last, will he value his triumph any the less?”