The point of view dictates our viewpoint into knowing things, whether that be from a third-person omnicscent to a first-person tell of tale. With your specific point of view comes things in detail for each kind.
We had hoped they had sent us an invitation too.
John Snow is known as the father of epidemiology.
In this essay "On the Mode of Cholera" he used both reasoned argument along with documentary evidence to show that cholera spread from person to person.
He gave examples of rows of houses on opposite sides to each other, and how all of the members in one row contracted cholera, while only one person on the opposite row contracted the disease.
Because it gives them pride in what they are doing