I agree with the one about not finding husbands, but bridesmaids.
I also have found this one online
"Sisterhood is the essence of all the wisdom of the ages, distilled into a single word. You cannot see sisterhood, neither can you hear it nor taste it. But you can feel it a hundred times a day. It is a pat on the back, a smile of encouragement. It's someone to share with, to celebrate your achievements."
-Selected from a pamphlet of Alpha Omicron Pi
http://www.negapc.org/greeklife/sorority_quotes.htm