A short, finished list rather than an endless feed: 100 of the best best friend quotes ever written, picked out of the full best friend archive on QuoteForever. You will find Sara Ramirez, Kristin Hannah, Arabella Weir and Beverly Cleary among them.
Read the list top to bottom, or use it as a starting point - every author name links to everything else they said, and every quote has its own page you can share or turn into an image.