Finding out what you’re good at, and doing it to the best of your ability, is the route to self-respect.

Her voice was now so shrill only bats would be able to hear it soon, but she had reached a level of indignation that rendered her temporarily speechless.

Harry witnessed Professor McGonagall walking right past Peeves who was determinedly loosening a crystal chandelier and could have sworn he heard her tell the poltergeist out of the corner of her mouth 'It unscrews the other way.

What happened down in the dungeons between you and Professor Quirrell is a complete secret, so, naturally the whole school knows.

There are plenty of eyewitness accounts, just because you're so narrow-minded you need to have everything shoved under your nose before you-

We can't choose our fate, but we can choose others. Be careful in knowing that.

Dumbledore says people find it far easier to forgive others for being wrong than being right.