Here are some quotes about 9/11 that I found:
- "No day shall erase you from the memory of time." — Virgil's Aeneid, which adorns the 9/11 Memorial Museum
- "Even the smallest act of service, the simplest act of kindness, is a way to honor those we lost, a way to reclaim that spirit of unity that followed 9/11." — Obama
- “The attacks of September 11th were intended to break our spirit. Instead we have emerged stronger and more unified."
I hope these quotes help you.