The truth is that Nature has in her hands a certain paste which is always the same which she is ever turning over and over again in a thousand ways and of which she forms men animals and plants. She has not formed Homer Demosthenes and Plato of a finer or better kneaded clay than our poets orators and philosophers. Do not object that minds are not material. They are connected by a material bond with the brain and it is the quality of this material bond that determines intellectual differences. -