Albus Dumbledore is the headmaster in the popular book series Harry Potter by J.K. Rowling.

Sourced

• "Welcome to a new year at Hogwarts! Before we begin our banquet, I would like to say a few words. And here they are: Nitwit! Blubber! Oddment! Tweak!"
  • Harry Potter and the Sorcerer's Stone - 1997

• "After all, to the well-organized mind, death is but the next great adventure."
  • Harry Potter and the Sorcerer's Stone - 1997

• "What happened down in the dungeons between you and Professor Quirrell is a complete secret, so, naturally the whole school knows."
  • Harry Potter and the Sorcerer's Stone - 1997

• "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."
  • Harry Potter and the Sorcerer's Stone - 1997

• "Fear of a name increases fear of a thing itself."
  • Harry Potter and the Sorcerer's Stone - 1997

• "After all, it does not do to dwell on dreams and forget to live."
  • Harry Potter and the Sorcerer's Stone - 1997

• "I believe your friends Misters Fred and George Weasley were responsible for trying to send you a toilet seat. No doubt they thought it would amuse you."
  • Harry Potter and the Sorcerer's Stone - 1997
• "I will only have truly left the school when none here are loyal to me"
  • Harry Potter and the Chamber of Secrets, when the Ministry has "got to act"-1998
• "It is our choices, Harry, that show what we truly are, far more than our abilities."
  • Harry Potter and the Chamber Of Secrets - 1998

• "You think the dead we love ever truly leave us? You think that we don't recall them more clearly than ever in times of great trouble?"
  • Harry Potter and the Prisoner of Azkaban - 1999

"happiness can be found in the darkest of times, if one remembers to turn on the light."- Harry Potter and the prisoner of askaban- 1999

• "If your determination to shut your eyes will carry you so far, Cornelius, then we have reached a parting of the ways.You must act as you see fit and I must act as I see fit."
  • Harry Potter and the Goblet of Fire - 2000

• "I sometimes find, and I am sure you know the feeling, that I simply have too many thoughts and memories crammed into my mind.... At these times... I use the Pensieve. One simply siphons the excess thoughts from one's mind, pours them into the basin, and examines them at one's leisure."
  • Harry Potter and the Goblet of Fire - 2000

• "Curiosity is not a sin.... But we should exercise caution with our curiosity... yes, indeed."
  • Harry Potter and the Goblet of Fire - 2000

• "Numbing the pain for a while will make it worse when you finally feel it."
  • Harry Potter and the Goblet of Fire - 2000

• "You place too much importance... on the so-called purity of blood! You fail to recognize that it matters not what someone is born, but what they grow to be!"
  • Harry Potter and the Goblet of Fire - 2000

• "It is my belief... that the truth is generally preferable to lies."
  • Harry Potter and the Goblet of Fire - 2000

• "Differences of habit and language are nothing at all if our aims are identical and our hearts are open."
  • Harry Potter and the Goblet of Fire - 2000

• "Remember, if the time should come when you have to make a choice between what is right, and what is easy, remember what happened to a boy who was good and kind and brave because he strayed across the path of Lord Voldemort."
  • Harry Potter and the Goblet of Fire - 2000

• "Youth cannot know how age thinks and feels. But old men are guilty if they forget what it was to be young..."
  • Harry Potter and the Order of the Phoenix - 2003

• "There is a room in the Department of Mysteries,... that is kept locked at all times. It contains a force that is at once more wonderful and more terrible than death, than human intelligence, than forces of nature. It is also, perhaps, the most mysterious of the many subjects for study that resides there. It is the power held within that room that you possess in such quantities and which Voldemort has not at all. That power took you to save Sirius tonight. That power saved you from possession by Voldermort, because he could not bear to reside in a body so full for the force he detests. In the end, it mattered not that you could close your mind. It was your heart that saved you."
  • Harry Potter and the Order of the Phoenix - 2003

• "By all means continue destroying my possessions, I daresay I have too many."
  • Harry Potter and the Order of the Phoenix - 2003

• "He [Voldemort] never paused to understand the incomparable power of a soul that is untarnished and whole."
  • Harry Potter and the Half Blood Prince - 2005

• "I would assume that you were going to offer me refreshment, but the evidence so far suggests that that would be optimistic to the point of foolishness."
  • Harry Potter and the Half Blood Prince - 2005

• "Age is foolish and forgetful when it underestimates youth."
  • Harry Potter and the Half Blood Prince- 2005

• "It is the unknown we fear when we look upon death and darkness, nothing more."
  • Harry Potter and the Half Blood Prince - 2005

• "No, I was merely reading the Muggle magazines," said Dumbledore. "I do love knitting patterns."
  • Harry Potter and the Half Blood Prince - 2005

• "I am not worried, Harry... I am with you."
  • Harry Potter and the Half-Blood Prince - 2005

• "Do not pity the dead, Harry. Pity the living, and, above all, those who live without love."
  • Harry Potter and the Deathly Hallows - 2007

• "Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?"
  • Harry Potter and the Deathly Hallows - 2007