The paragraph development by examples is usually used to be able to illustrate with the generality of one extended example instead of illustrating the series of details. Through the use of development by examples, the clarity in the paragraph could be developed.
There is one good quotation to this situation. It is : You don't have to explain yourself, for your enemies won't believe it, and your friends won't need it. So, why should we bother explaining ourselves?
An explaination for why gravity works.