There are more than 85 million mothers in the United States, and Sunday is the day we celebrate them all. Sons, daughters, grandchildren and nonbiological family members across the country will spend Mother's Day recognizing the people who raised them.

If you're looking for a nice phrase to write in your mom's card, say over the phone or post on her Facebook wall, look no further. Here are 30 inspirational quotes about moms, collected from Goodreads, Quote Garden, ProFlowers and

"Only mothers can think of the future — because they give birth to it in their children." — Maxim Gorky

“Our mothers always remain the strangest, craziest people we've ever met.” ― Marguerite Duras

"Biology is the least of what makes someone a mother." — Oprah Winfrey

GettyImages-474615077 Crocuses bloom in Hyde Park as the first signs of spring begin to show across the United Kingdom on Feb. 24, 2014 in London. Photo: Getty Images

“My mother ... she is beautiful, softened at the edges and tempered with a spine of steel. I want to grow old and be like her.” ― Jodi Picoult

“Such a mysterious business, motherhood. How brave a woman must be to embark on it.” ― M.L. Stedman

“All that I am or ever hope to be, I owe to my angel mother.” ― Abraham Lincoln

“The best thing she was, was her children.” ― Toni Morrison

"It has been a terrible, horrible, no good, very bad day. My mom says some days are like that." — Judith Viorst

"Men are what their mothers made them." — Ralph Waldo Emerson

“Making the decision to have a child — it's momentous. It is to decide forever to have your heart go walking outside your body.”― Elizabeth Stone

“Mothers are all slightly insane.” ― J.D. Salinger

“A mother is a mother from the moment her baby is first placed in her arms until eternity. It didn't matter if her child were 3, 13, or 30.” ― Sarah Strohmeyer

“Mothers can forgive anything! Tell me all, and be sure that I will never let you go, though the whole world should turn from you.” ― Louisa May Alcott

"A suburban mother’s role is to deliver children obstetrically once, and by car forever after." — Peter De Vries

"A mother is not a person to lean on, but a person to make leaning unnecessary." — Dorothy Canfield Fisher

"Most mothers are instinctive philosophers." — Harriet Beecher Stowe

“A mother knows what her child's gone through, even if she didn't see it herself.” ― Pramoedya Ananta Toer

"You sacrificed for us. You're the real MVP." — Kevin Durant

"If the whole world were put into one scale, and my mother in the other, the whole world would kick the beam." — Henry Bickersteth

"God could not be everywhere, and therefore he made mothers." — Rudyard Kipling