National Sisters Day is celebrated on the first Sunday of August every year and gives an opportunity to show appreciation to one of the strongest bonds. In this image, Fabiola Letelier, human rights lawyer and sister of Orlando Letelier, a former Foreign Minister of Salvador Allende government, who was killed when his car exploded in Washington in 1976, is awarded with the Human Rights National Prize in Santiago, Chile, July 23, 2018. RUETERS/Ivan Alvarado

National Sisters Day is celebrated on the first Sunday of August every year and provides an opportunity to show appreciation to one of the strongest bonds and also to acknowledge the joy that sisterhood brings to life.

Having a sister is a blessing and on this day we take a look at 10 sayings and quotes about the special bond from Bustle and Brainy Quotes.

1. “Sister is probably the most competitive relationship within the family, but once the sisters are grown, it becomes the strongest relationship,” — Margaret Mead, American cultural anthropologist

2. “Sisters, as you know, also have a unique relationship. This is the person who has known you your entire life, who should love you and stand by you no matter what, and yet it’s your sister who knows exactly where to drive the knife to hurt you the most,” — Lisa See, American writer

3. "A sister can be seen as someone who is both ourselves and very much not ourselves — a special kind of double,” — Tina Morrison, American novelist

4. “For there is no friend like a sister in calm or stormy weather; To cheer one on the tedious way, to fetch one if one goes astray, to lift one if one totters down, to strengthen whilst one stands,” Christina Georgina Rossetti, poet

5. “An older sister is a friend and defender — a listener, conspirator, a counsellor and a sharer of delights. And sorrows too.” — Pam Brown, poet

6. "She is your mirror, shining back at you with a world of possibilities. She is your witness, who sees you at your worst and best, and loves you anyway. She is your partner in crime, your midnight companion, someone who knows when you are smiling, even in the dark. She is your teacher, your defense attorney, your personal press agent, even your shrink. Some days, she's the reason you wish you were an only child." — Barbara Alpert, author

7. "Being a twin, and being my sister's twin, is such a defining part of my life that I wouldn't know how to be who I am, including a writer, without that being somehow at the centre." — Taiye Selasi, writer

8. “My sister is my little star, and I'm excited for her and proud of her. With her, I'm protective, but also I don't want to be that sister who's really pushy and thinks they know everything and making her feel like she doesn't know what she's doing. I'm trying to be that cool older sister and not the mom, but it's hard,” — Gigi Hadid, model

9. "A sister is a gift to the heart, a friend to the spirit, a golden thread to the meaning of life,"— Isadora James, author

10. “Your sister knows everything to say to piss you off. But sisters tend to be each other's biggest champion and also their hardest critics,” — Erin Foster, writer