The inner eye does not see upon command.

“The mind is a complex and many-layered thing, Potter... or at least, most minds…”

“Yeah,” said Harry. “No more pretending we care what happens when Jupiter and Ur…”

“You see!" said a strained voice. Tonks was glaring at Lupin. "She still wants t…”

“On the count of three, we will cast our first spells. Neither of us will be aim…”