Oh, for heaven’s sake, Sirius, Dumbledore said no!” A bearlike black dog had appeared at Harry’s side as Harry clambered over the various trunks cluttering the hall to get to Mrs. Weasley. “Oh honestly,” said Mrs. Weasley despairingly. “Well, on your own head be it!” The great black dog gave a joyful bark and gamboled around them, snapping at pigeons, and chasing its own tail. Harry couldn’t help laughing. Sirius had been trapped inside for a very long time.

I like a quiet life, you know me.

Why had he never appreciated the miracle that he was, brain and nerve and bounding heart?

He had grown used to the idea that Dumbledore could solve anything.

When you have that last piece of the jigsaw, everything will, I hope, be clear..." -Albus Dumbledore

He's a funny man, Dumbledore. I think he sort of wanted to give me a chance. I think he knows more or less everything that goes on here, you know. I reckon he had a pretty good idea we were going to try, and instead of stopping us, he just taught us enough to help. I don't think it was an accident he let me find out how the Mirror worked. It's almost like he thought I had the right to face Voldemort if I could.

Failure means a stripping away of the inessential.