Who said "I've got to learn to be more aggressive."?

This quote is attributed to Charlie Brown.

I've got to learn to be more aggressive. - Charlie Brown

"I've got to learn to be more aggressive."

Charlie Brown Strength

"Good grief!"

"I got a rock."

"Rats! I did it again."

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

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."