Why do ancient people write poems, which are eloquent and meaningful? How can I do it?

Generally, the ancient scholars usually recite ancient poems with three-character classics from childhood, and then the four books and five classics. That's really not just memorizing, but reading other books, which are basically classical Chinese, and some classical Chinese are really abstruse, not as simple as those in school textbooks, and they are all nurtured from childhood, and they have a language environment. Therefore, if you are not a child now, it is difficult to achieve the realm of eloquence, and you can only chew classical Chinese books every day, but you may not be able to do it. The way of thinking between modern people and ancient people has been very different. I think, in fact, compared with the ancients, classical Chinese is the vernacular of their time.