He Didn't Tell Harry That He Was Likely A Horcrux This is the most specific and worst lie that Dumbledore ever told Harry. He didn't tell Harry that he was likely a Horcrux himself and would, therefore, need to die in order to defeat Voldemort for good.
The big “secret” about the Dumbeldore family that the title promises is actually an explanation of the last film's cliffhanger. Albus confirms to Creedence early on in the film that he is in fact a Dumbledore, quashing any rumor that Grindelwald had lied to the young boy in order to sway him to his movement.
Dumbledore believed that he knew what was best for everyone, whether it be using Snape's guilt and grief to turn him to the Light side or lying to Harry to protect him from knowledge of his fate.
Harry asked his headmaster what he saw in the mirror, and Dumbledore answered that he saw himself with some socks. Of course, this wasn't true, but it might have been a little too personal to tell him that he saw himself with the sister he felt responsible for killing.
Dumbledore was able to sense Harry and Ron beneath the invisibility cloak by discreetly performing a non-verbal Human-presence-revealing Spell.
Fitting with the secrecy Dumbledore maintained around Harry, author J.K. Rowling later revealed that, at that stage of his life, Dumbledore actually saw his own family, especially his dead sister Ariana.
He has grown afraid of Harry's connection to Voldemort. Perhaps Voldemort, knowing Dumbledore's love for Harry, would possess Harry and provoke Dumbledore to kill him. So, Dumbledore attempted to avoid Harry throughout Book 5 for Harry's own good.
After it was revealed that Dumbledore was devastated by the accidental death of his sister during a fight with Grindelwald and his brother, Aberforth, it became clear that Dumbledore's deepest desire, and regret, involved his family.
At the age of six, Ariana was attacked by Muggle boys who saw her practicing magic, and, when she couldn't show them the trick, attacked her in an attempt to stop her from using the magic. This left her traumatised to the point of rendering her magical abilities unstable and uncontrollable.
Dumbledore knew that destroying Voldemort's horcruxes was the only way to truly defeat him. He believed that Harry was the one person who was smart, courageous, and perhaps lucky enough to find and eliminate all the horcruxes.
Dumbledore reveals how thoroughly he loves Harry. Harry is brave, and Dumbledore is proud as any father would be. More than that, Dumbledore succumbs to a parent's weakness; he cares more about Harry's happiness and wellbeing than the wizarding world he is trying to protect.
Pink Moon Room- Dumbledore Defense Squad
Dumbledore groomed Harry into a child soldier for the purpose of prepping him for his “suicide bombing”. Harry was manipulated by Dumbledore into doing suicide so Voldemort and his Death Eaters could be taken down.
Given that the third film takes place in the early 1930s, we still have a little over a decade to go until the legendary duel in 1945 that netted Albus the Elder Wand (one of the Deathly Hallows) and saw Grindelwald trapped in his own castle until he was murdered by Voldemort years later.
Unbeknownst to Harry, for a long time, Dumbledore's greatest desire was to be with his former lover, Gellert Grindelwald.
Credence captures the Qilin and returns to Grindelwald, not realising that two were born that night. Grindelwald later orders Credence to murder his uncle Albus Dumbledore in Berlin, claiming that the Dumbledores knowingly abandoned him.
"Dumbledore fell in love with Grindelwald" and was "blinded" by it. "This was Dumbledore's tragedy."
Author JK Rowling announced Albus Dumbledore was gay in 2007. It's known that he and Grindelwald were in a romantic relationship but it had never been explored in the previous Harry Potter films. Fantastic Beasts 3 might address the depth of their relationship.
“Dumbledore didn't want to lose his wand at that point and Draco disarmed him. So that meant that the wand gave Draco its allegiance, even though Draco never knew it, even though Draco never touched it. “From that moment on, that wand gave its allegiance to Draco, and it wouldn't work as well for anyone but Draco.”
He finds out for sure immediately after Nagini's attack on Arthur Weasley. This night is significant in many ways. While Harry sleeps, he enters Nagini's mind.
Although he caught Harry breaking the rules , he did not give any punishments as it would discourage Harry's natural instinct to detect trouble and try to contain it: which is exactly what Dumbledore required to ensure Harry continued the fight against Voldemort and finish him.
Dumbledore had to keep certain things hidden from Harry just in case Voldemort read his mind. He did not want Harry knowing that Snape brought the sword of Gryffindor for that reason, it is very likely that he did not want Harry knowing that he planed to have Snape kill him for the very same reason. Save this answer.
The only time he acted out of Moody's character was when he took Harry out of Dumbledore's sight in the aftermath of Voldemort's return, and Dumbledore immediately noticed it as such and realized he was an imposter, which is how he saved Harry's life (again) at the end of Goblet of Fire.
The Emerald Potion, also known as the Drink of Despair, is a mysterious potion which induces fear, delirium, and extreme thirst. According to Dumbledore, the potion cannot be penetrated by hand, vanished, parted, scooped up, siphoned away, transfigured, charmed, or otherwise made to change its nature in any way.
Dumbledore's words to Harry about the Mirror are not to dwell on dreams and forget to live.