Who said "The greatest knowledge is self-knowledge."?

This quote is attributed to Muhammad.

The greatest knowledge is self-knowledge. - Muhammad

"The greatest knowledge is self-knowledge."

Muhammad

Religious Leader Prophet Arabian 570–632

"The best of you are those who have the best manners and character."

"Seek knowledge even if it is in China."

"The greatest jihad is to battle your own soul."

"Do not lose hope, nor be sad."