Who said "Kindness costs nothing, but it's worth everything."?

This quote is attributed to Serena Williams.

Kindness costs nothing, but it's worth everything. - Serena Williams

"Kindness costs nothing, but it's worth everything."

Serena Williams Kindness

Professional Tennis Player American Born 1981 (age 45)

"I really think a champion is defined not by their wins and losses, but by can they keep moving forward after defeat."

"Be bold, be courageous, be your best."

"I really think a champion is defined by their ability to overcome."

"The success of every woman should be the inspiration to another."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."