How does the author use foreshadowing in Knowledge?

Addonizio's poem ends with an awareness of fear, and an acknowledgment that the horrors of the past might well presage worse events in the future. She holds that one indeed has reason to be afraid, as the future will hold more to "know," more to grasp that will remind humankind that not all people are "fundamentally good," as is perhaps too often believed. Fear about what might still happen is prevalent throughout the poem; indeed, that fear is the central focus underlying the text. In spite of people's innate willingness to believe in the goodness of humankind, ample evidence of evil exists. The poet uses the word "afraid" prominently, at the end of line 19, as she brings the poem to a close. Thus, the image that she leaves with her readers is a depressing reminder that while one may believe that no event could be worse than what has already taken place, the possibility of worse horror remains. This possibility is what creates so much fear.