Albus Dumbledore quotes from Harry Potter and the Prisoner of Azkaban (2004)

Albus Dumbledore

Happiness can be found even in the darkest of times, when one only remembers to turn on the light.

Albus Dumbledore

Dementors are vicious creatures. They'll not distinguish... between the one they hunt and the one who gets in their way. Therefore, I must warn each and every one of you, to give them no reason to harm you. It is not in the nature of a dementor to be forgiving. But you know, happiness can be found... even in the darkest of times... if one only remembers to turn on the light.

Albus Dumbledore

For in dreams, we enter a world that is entirely our own. Let him swim in the deepest of oceans or glide over the highest cloud.

Albus Dumbledore

A child's voice, however honest and true, is meaningless to those who've forgotten how to listen.

Albus Dumbledore

Mysterious thing, time. Powerful, and when meddled with, dangerous. Sirius Black is in the topmost cell of the dark tower. You know the laws, Miss Granger. You must not be seen. And you would do well, I feel, to return before this last chime. If not, the consequences are too ghastly to discuss. If you succeed tonight, more than one innocent life may be spared.

Harry

We did it, sir. He's free.

Dumbledore

Did what? Good night.

Dumbledore

Mr. Filch? Round up the ghosts. Tell them to search every painting in the castle to find the Fat Lady.

Mr. Filch

There's no need for ghosts, Professor. [points to a painting on the next floor] The Fat Lady's there.

Dumbledore

Dear lady, who did this to you?

Fat Lady

Eyes like the devil, he's got, and a soul as dark as his name. It's him, Headmaster. The one they all talk about. He's here, somewhere in the castle. Sirius Black! [sobs in fright and cowers]

Dumbledore

Secure the castle, Mr. Filch. [to all the students] The rest of you, the Great Hall.