The inner eye does not see upon command.

“Poor Crookshanks, that witch said he’d been in there for ages; no one wanted hi…”

“If she could have died...if she could have disappeared forever...but the solid …”

“There is no shame in what you are feeling, Harry,' said Dumbledore's voice. 'On…”

“Brains like that, you could be a Death Eater, son.”