Final answer:
Coelho uses personification and prosopopoeia in the poem to add depth and emotion to the language and to create a sense of connection and understanding for the reader.
Step-by-step explanation:
Coelho decides to use personification, specifically prosopopoeia, in the poem because it adds depth and emotion to the language. By assigning human characteristics to non-human entities, Coelho creates a sense of connection and brings these abstract concepts to life. This technique allows readers to better understand and relate to the ideas being conveyed.