I believe in hard work and luck, and that the first often leads to the second
Don't count your owls before they are delivered.
Potter! There are hundreds of people thundering through my pub!
The mistake ninety-nine percent of humanity made, as far as Fats could see, was being ashamed of what they were; lying about it, trying to be somebody else.
All's fair in love and war," said Ron brightly, "and this is a bit of both.
You sometimes have to join forces with those you'd rather avoid.