Harry Potter and the philosopher's stone - J. K. Rowling

It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.

The truth. It is a beautiful and terrible thing, and should therefore be treated with caution.

It does not do to dwell on dreams and forget to live.

To the well-organized mind, death is but the next great adventure.

Enter, stranger, but take heed
Of what awaits the sin of greed,
For those who take, but do not earn,
Must pay most dearly in their turn,
So if you seek beneath our floors
A treasure that was never yours,
Thief, you have been warned, beware
Of finding more than treasure there.