From Quotations from the Harry Potter Series

As much money and life as you could want! The two things most human beings would choose above all - the trouble is, humans do have a knack of choosing precisely those things that are worst for them.
~J.K. Rowling, "The Man with Two Faces," Harry Potter and the Sorcerer's Stone, 1997, spoken by the character Albus Dumbledore.

If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.
~J.K. Rowling, "Padfoot Returns," Harry Potter and the Goblet of Fire, 2000, spoken by the character Sirius Black

It is my belief... that the truth is generally preferable to lies.
~J.K. Rowling, "The Beginning," Harry Potter and the Goblet of Fire, 2000, spoken by the character Albus Dumbledore

From ARMillier's Harry Potter quotes

Year 1 -- Harry Potter and the Sorcerer's Stone

• The truth. It is a beautiful and terrible thing, and should therefore be treated with great caution. -- Dumbledore, page 298
• There are all kinds of courage. It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends. -- Dumbledore, page 306

Year 2 -- Harry Potter and the and the Chamber of Secrets

• It is our choices, Harry, that show what we truly are, far more than our abilities. -- Dumbledore, page 333

Year 3 -- Harry Potter and the Prisoner of Azkaban

• The consequences of our actions are always so complicated, so diverse, that predicting the future is a very difficult business indeed. -- Dumbledore, page 426
• You can exist without your soul, you know, as long as your brain and heart are still working. But you'll have no sense of self anymore, no memory, no ... anything. There's no chance at all of recovery. You'll just — exist. As an empty shell. And your soul is gone forever ... lost. -- Lupin, page 247
• You think the dead we loved ever truly leave us? You think that we don't recall them more clearly than ever in times of great trouble? Your father is alive in you, Harry, and shows himself most plainly when you have need of him. How else could you produce that particular Patronus? Prongs rode again last night. -- Dumbledore, page 427

Beatles Think For Yourself Lyrics (Harrison) I've got a word or two To say about the things that you do You're telling all those lies About the good things that we can have If we close our eyes Do what you want to do And go where you're going to Think for yourself 'Cause I won't be there with you I left you far behind The ruins of the life that you had in mind And though you still can't see I know your mind's made up You're gonna cause more misery Do what you want to do And go where you're going to Think for yourself 'Cause I won't be there with you Although your mind's opaque Try thinking more if just for your own sake The future still looks good And you've got time to rectify All the things that you should Do what you want to do And go where you're going to Think for yourself 'Cause I won't be there with you Do what you want to do And go where you're going to Think for yourself 'Cause I won't be there with you Think for yourself 'Cause I won't be there with you