Mohandas Gandhi was the preminent leader of the indian independence
movement in the british ruled india. he is credited with saying:

You must be the change you wish to see in the world

Helen adams keller was an american author, political activist, and
lecturer. she was the first deafblind person to earn a bachelor of arts
degree she is credited with saying:

the best and most beautiful things in the world cannot be seen or even
touched - they must be felt with the heart.

Samual langhorne clemens better known by his pen name mark twain, was
an american author and humorist. He wrote The Adventurers of Tom Sawyer
and its sequal adventures of huckleberry Finn the latter often
called the great american novel he is credited with saying

Kindness is the language which the deaf can hear and the blind can see