"Principal Skinner: Of course we could make things more challenging, Lisa but then the stupider students would be in h…"

"Lisa Simpson: It's too hard. My hand is slipping. I can't do this, Bart. I'm not strong enough."

"If not, resolve, before we go, That you and I must pull a crow. Y' 'ad best (quoth Ralpho), as the Ancients Say wisel…"

"Only those who will risk going too far can possibly find out how far one can go."

"There is no correlation between material and spiritual misery. Only to the lowest and dullest levels of society can o…"

"Never measure the height of a mountain, until you have reached the top. Then you will see how low it was."

"James Howard "Fats" Brown: Believe me, I've only been doing my job. Someone has to keep the flame. Someone has to wee…"

"Only those who dare to fail greatly, can ever achieve greatly."

"Norrin Radd: Those to whom no distant horizons beckon ... for whom no challenges remain ... though they have inherite…"

"The greatest challenge to any thinker is stating the problem in a way that will allow a solution."