Here are some quotes about supportive friends:

- "All love that has not friendship for its base, is like a mansion built upon the sand." – Ella Wheeler Wilcox
- "Friendship is a mutual blackmail elevated to the level of love." – Robin Morgan
- "Nothing makes the earth seem so spacious as to have friends at a distance; they make the latitudes and longitudes." – Henry David Thoreau
- "I think if I've learned anything about friendship, it's to hang in, stay connected, fight for them, and let them fight for you. Don't walk away, don't be distracted, don't be too busy or tired, don't take them for granted." – Anonymous
- "Friends are the family you choose." – Jess C. Scott
- "Love is the only force capable of transforming an enemy into a friend." – Martin Luther King Jr.

I hope these quotes help you find what you're looking for. Let me know if there's anything else I can help you with.