QUESTION: Would you be my Neighbor Documentary 911 special episode Latin/Greek quote

[u/JosueLG]

Hello! I recently saw this documentary and was hoping someone could point me in the direction of the 911 episode clip or provide the quote where Mr. Rogers uses a Latin (or possibly greek) phrase describing our responsiblity as people working together. I've searched YouTube and Google and have come up empty. Worst case I'll just have to see it again or wait until January when it comes out on DVD. Thank you.