Not all wizards are good.

Not Slytherin, eh? Are you sure?

When I call your name, you will come forth.

How can it? Both my parents are dead.

...l just hope you realize how fortunate you are.

Mummy, Dad, come here! you won't believe what this snake is doing!

Come on now, hurry up. Stick your right hand over the broom and say, "Up."

Does that mean, with the Stone gone that is, that Voldemort can never come back?

How often do you come across a three-headed dog, even if you're in the trade?

We'll soon find out that some wizarding families are better than others, Potter.

As for monkshood and wolfsbane, they are the same plant, which also goes by the name of aconite.