Who said "Beware of people who have nothing to lose."?

This quote is attributed to Charlie Brown.

Beware of people who have nothing to lose. - Charlie Brown

"Beware of people who have nothing to lose."

Charlie Brown Wisdom

"Good grief!"

"I got a rock."

"Rats! I did it again."

"Why is it that everything I do turns into a disaster?"

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."