In a novel you have to resist the urge to tell everything.

Harry, we saw Uranus up close!” said Ron, still giggling feebly. “Get it, Harry? We saw Uranus — ha ha ha —

Where are you heading, if you’ve got the choice?” James lifted an invisible sword. “‘Gryffindor, where dwell the brave at heart!’ Like my dad.” Snape made a small, disparaging noise. James turned on him. “Got a problem with that?” “No,” said Snape, though his slight sneer said otherwise. “If you’d rather be brawny than brainy —” “Where’re you hoping to go, seeing as you’re neither?” interjected Sirius.

I AM NOT PAYING FOR SOME CRACKPOT OLD FOOL TO TEACH HIM MAGIC TRICKS!" yelled Uncle Vernon. Hagrid seized his pink umbrella and whirled it over his head "NEVER -" he thundered "- INSULT -ALBUS -DUMBLEDORE - IN - FRONT - OF - ME!

Some failure in life is inevitable. It is impossible to live without failing at something, unless you live so cautiously, that you might as well not have lived at all. In which case you have failed by default. Failure gave me an inner security that I had never obtained by passing examinations. Failure taught me things that I could not have learned any other way. I discovered I had a strong will and more discipline than I had suspected.

And I must draft an advertisement for the Daily Prophet, too,' he added thoughtfully. 'We'll be needing a new Defense Against the Dark Arts teacher.... Dear me, we do seem to run through them, don't we?

I think they thought it was very arrogant of me to write the end of my seven books series when I didn't have a publisher and no-one had heard of me