Who said "Bart, sometimes you have to stand alone."?

This quote is attributed to Lisa Simpson.

Bart, sometimes you have to stand alone. - Lisa Simpson

"Bart, sometimes you have to stand alone."

Lisa Simpson Courage

"I'm not a bad girl, I'm just drawn that way."

"The only way to win is to not play."

"Understanding is the first step toward love."

"If something is hard to do, then it's not worth doing."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."