The cornerstone on which all things are based is man's concept of himself. He acts as he does and has the experiences that he does, because his concept of himself is what it is, and for no other reason. Had he a different concept of self, he would act differently. A change of concept of self automatically alters his future: and a change in any term of his future series of experiences reciprocally alters his concept of self. Man's assumptions which he regards as insignificant produce effects that are considerable; therefore man should revise his estimate of an assumption, and recognize its creative power.