Answer: the phrase poems in their souls is a representation of the feelings and emotions they have inside them.
Explanation: The previous phrases imply that people are reunited in a place where exciting things are about to happen. Since poems are an artistic medium where people portray their deepest emotions, the figurative meaning of the phrase "poems in their souls" is a representation of different emotions like hope and belief that are now appearing within them, just as If poems were in their minds.
