"Surely "the doctrine that all men are sinners and have the essential sin of Adam is a challenge to justice, mercy, love and omnipotent fairness." Some writers of old authoritatively declared that God created man in his own image. Some modern thinkers state, on the contrary, that man created God in his own image. With the growth of civilization man's concept of God also became more and more refined. It is however, impossible to conceive of such a being either in or outside the universe. Could this variation be due to heredity and environment? One must admit that all such chemico-physical phenomena revealed by scientists, are partly instrumental, but they cannot be solely responsible for the subtle distinctions and vast differences that exist amongst individuals. Yet why should identical twins who are physically alike, inheriting like genes, enjoying the same privilege of upbringing, be very often temperamentally, morally and intellectually totally different? Heredity alone cannot account for these vast differences. Strictly speaking, it accounts more plausibly for their similarities than for most of the differences. … With regard to the more complex and subtle mental, intellectual and moral differences we need more enlightenment. The theory of heredity cannot give a satisfactory explanation for the birth of a criminal in a long line of honourable ancestors, the birth of a saint or a noble man in a family of evil repute, for the arising of infant prodigies, men of genius and great religious teachers. According to Buddhism this variation is due not only to heredity, environment, "nature and nurture," but also to our own kamma, or in other words, to the result of our own inherited past actions and our present deeds. We build our own hells. We create our own heavens. We are the architects of our own fate. In short we ourselves are our own kamma."