Answer:
It allows readers to discover the lesson the same way he did.
Step-by-step explanation:
In this poem, William Wordsworth describes his experience in the same order in which it took place. He begins the poem by describing his wanderings, and ends it by describing the effect that this had on him. The reason why Wordsworth placed the central idea at the end of the poem was because he wanted to allow readers to discover the lesson in the same way and the same order in which he did.