It was a shame, but as Ron said, you couldn't have everything in life.

Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. Love as powerful as your mother's for you leaves it's own mark. To have been loved so deeply, even though the person who loved us is gone, will give us some protection forever.

Indifference and neglect often do much more damage than outright dislike ...We wizards have mistreated and abused our fellows for too long, and we are now reaping our reward.

Professor,” Harry gasped. “Your bird — I couldn’t do anything — he just caught fire —

You sometimes have to join forces with those you'd rather avoid.

Never try to understand the students. They hate it. They would much rather be tragically misunderstood, wallow in self-pity, stew in their own —” “That’s enough, Phineas,” said Dumbledore.

You have to be free to fail in this world.