Who said "Kindness is never a sign of weakness."?

This quote is attributed to Team Rocket.

Kindness is never a sign of weakness. - Team Rocket

"Kindness is never a sign of weakness."

Team Rocket Kindness

"Prepare for trouble, and make it double!"

"To protect the world from devastation!"

"To unite all peoples within our nation!"

"To denounce the evils of truth and love!"

"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."