As the post mentioned Shaw's believe that in the process of evolution, human is that human have a choice that will help shape and influence future generation to come. In a way it is similar to what Darwin has proposed that species going through small modification over time in order to better adapt to the ever changing environment. However, using human as an example, the key differences is that from Darwin's perspective, human's self-consciousness has no bearing on physical Changes occurred on our specie. therefore is not a product of our attention; in other word what we want does not affect what we get. In Shaw's opinion on the other hand, it is quite opposite. The changes overtime on one specie is a result of constant strive for one particular trait, and it is those endless effort of bettering our-self which eventually lead us to the change.