He also elaborates on the advantages created by the adaptive change of primates to their environment and even to the evolving complexity of primate social structures. In 1772 in a letter to James Harris, Monboddo articulated that his theory of language evolution (Harris 1772) was simply a part of the manner that man had advanced from the lower animals, a clear precedent of evolutionary thought. Furthermore, he established a detailed theory of how man adaptively acquired language to cope better with his environment and social needs. He argued that the development of language was linked to a procession of events: first developing use of tools, then social structures and finally language. This concept was quite striking for his era, because it departed from the classical religious thinking that man was created instantaneously and language revealed by God. In fact, Monboddo was deeply religious and pointed out that the creation events were probably simply allegories and did not dispute that the universe was created by God. Monboddo was a vigorous opponent of other scientific thinking that philosophically questioned the role of God (see Monboddo's prolific diatribes on Newton's theories).