1. "Sisters may drive you crazy, get into your stuff, and irritate you. However, if anyone else dares say so, a sister will defend you to the death."
2. "A sister is a special type of angel on earth who brings out your best qualities."
3. "Sisters help make the hard times easier and the easy times more fun."
4. "Sister, we share so many moments that no one else will understand. We laugh at inside jokes, have our own catch phrases, and understand each other's joy and pain."
5. "Being without your sister is like being without your heart and soul."
6. "As children, we fought and argued over everything, but as adults, we are the very best of friends."
7. "Sister, no matter how old we get, being with you is like being a little girl again."
8. "The best gift mom and dad ever gave me was you."
9. "She's not just my best friend; she's my sister."
10. "Sister, you are my human diary. You know all my secrets and the deepest wishes of my heart."
11. "You're not my best friend. You're my sister, and that's more." — Jenny Han
12. "A sister is a gift to the heart, a friend to the spirit, a golden thread to the meaning of life." — Isadora James
13. "Sweet is the voice of a sister in the season of sorrow." — Benjamin Disraeli
14. "A sister is a little bit of childhood that can never be lost." — Marion C. Garretty
15. "Sisters make the best friends in the world." — Marilyn Monroe
16. "Sisters function as safety nets in a chaotic world simply by being there for each other." — Carol Saline
17. "Side by side or miles apart, we are sisters connected by heart."
18. "A loyal sister is worth a thousand friends."
19. "Sisters are for sharing laughter and wiping tears."
20. "Your sister knows the song in your heart and can sing it back to you when you have forgotten the words."