Who said "Knowledge of yourself is the most important knowledge."?

This quote is attributed to Serena Williams.

Knowledge of yourself is the most important knowledge. - Serena Williams

"Knowledge of yourself is the most important knowledge."

Serena Williams Knowledge

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."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."