im doing discussion questions

I think the quote is:

“We cannot tell the precise moment when friendship is formed. As in filling a vessel drop by drop, there is at last a drop which makes it run over; so in a series of kindnesses there is at last one which makes the heart run over.”

Montag doesn't have many friendships of meaning in the book and those he makes, like with Clarisse and Faber, are cut short. Still, I think had Clarisse lived longer and Montag able to see her, their friendship would be like the quote.