" By the sound of things, you know nothing about mathematics.'
'You can put it like that. I'm utterly useless.'
'Useless is such a harsh word, you are merely... inexperienced. So I thought we could start at the beginning.'
'I'm not that stupid. I know how to add, subtract and multiply-'
'I don't mean that kind of beginning... "

― Charlotte Munro , The Lockharts