Friday is World Kindness Day, a celebration of people who want to bring goodness into the world. On Nov. 13th, 1998, the World Kindness Movement was officially designated a holiday and the international community has observed it ever since.  

After you've done your good deed, spread the gospel! Here are 17 famous quotes about kindness from writers, leaders and other historic figures, collected from GoodReads, Inspiremykids and Inc.:

"A single act of kindness throws out roots in all directions, and the roots spring up and make new trees." ― Amelia Earhart

“No act of kindness, no matter how small, is ever wasted.” ― Aesop

“When you are kind to others, it not only changes you, it changes the world.” – Harold Kushner

“Never be so busy as not to think of others.” – Mother Teresa

“If we have the opportunity to be generous with our hearts, we have no idea of the depth and breadth of love's reach.” ― Margaret Cho

“Three things in human life are important: the first is to be kind. The second is to be kind. And the third is to be kind.” ― Henry James

“Kindness is a language which the deaf can hear and the blind can see.” ― Mark Twain

“It's all a matter of paying attention, being awake in the present moment, and not expecting a huge payoff. The magic in this world seems to work in whispers and small kindnesses.” ― Charles de Lint

“There is no exercise better for the heart than reaching down and lifting people up.” – John Holmes

“Be a little kinder than you have to.” ― E. Lockhart

"A warm smile is the universal language of kindness." ― William Arthur Ward

“Kindness is stronger than iron bars.” ― Margaret George

“You cannot do a kindness too soon, for you never know how soon it will be too late.” ― Ralph Waldo Emerson

“Goodness is the only investment that never fails.” – Henry David Thoreau

“He who sees a need and waits to be asked for help is as unkind as if he had refused it.” ― Dante Alighieri

“The smallest act of kindness is worth more than the grandest intention.” ― Oscar Wilde

“The simple act of caring is heroic.” – Edward Albert