Any person is indeed a keeper of all the five elements. It would be perfect, if all these elements were in balance, but you can rarely see that. One person will have more from the Fire, another - from the Water, the third - from Metal or Wood, etc. Therefore, we are all so different from each other: it is the predominance of one element or a combination of elements is giving us our identity and is creating our character, effecting the temperament. And the world, which the person of Fire would create for himself, is usually quite different from the world of the person of Earth, for example.