“Citizens, imagination usually sets the limits of the possible and the impossible; but when you have the will to do good, you must have the courage to cross these limits.”

“Never be limited by other people’s limited imaginations… If you adopt their attitudes, then the possibility won’t exist because you’ll have already shut it out… You can hear other people’s wisdom, but you’ve got to re-evaluate the world for yourself.”

“Imagine no limitations; decide what's right and desirable before you decide
what's possible.”

“Givers have to set limits because takers rarely do.”

“Never, ever, let anyone tell you what you can and can't do. Prove the cynics wrong. Pity them for they have no imagination. The sky's the limit. Your sky. Your limit. Now. Let's dance.”

“You must, therefore, know your limits of self-defence; so as not to cross the line of mercy and forgiveness.”

“But courage, and patience, and faith, and hope have their limit. Blessed be the man who escapes such trial as will determine limit!”

“When you hit a wall – of your own imagined limitations – just kick it in.”

“There's no such thing as im-POSSIBLE, Hiccup, only im-PROBABLE. The only thing that limits us are the limits to our imagination”

“The aim of the book is to set a limit to thought, or rather — not to thought, but to the expression of thoughts: for in order to be able to set a limit to thought, we should have to find both sides of the limit thinkable (i. e. we should have to be able to think what cannot be thought).
It will therefore only be in language that the limit can be set, and what lies on the other side of the limit will simply be nonsense.”