Many scientists are hesitant to even ask questions concerning origins.
It is most important to recognize in this definition that one who accepts it is accepting not just a biological theory but a worldview. Something so far-reaching in its scope and so comprehensive in its implication for us demands serious scrutiny. Such and examination can only be done in and abbreviated way in one article, but it is the intention of the author to stimulate the thinking of our readers. A most important aspect of Huxley's definition is the directionality of the change that he says occurs in evolution. Note also that this directional change is not brought about by an external agency, such as a God, but rather by self-transformation.