"The sea’s blue reflects because of the sky’s blue. Just like detectives and thieves. We’re all toying with the human mind. But the one who pries for others’ secrets is the one who’s truly impolite."
"People have emotions. A troublesome attribute that's not only invisible, but also changes easily. If it's friendship or love, then that's fine. But if by some trigger it changes to malice and vengeance, then that could bring forth thoughts of murder."
"You’d better not (rip my mask). Like Pandora’s box, you want to open it because you don’t know what’s inside. But if you know what’s inside before you open it… It’s boring, isn’t it?"
"You're always away during the important times and all you do is call. There are times when you are finally here, but then you disappear unexpectedly. Every time... every time... always, always, leaving me behind alone. What do you think I am? I love you Shinichi!"
"It's just like changes in the notes and passports. You may find it hard to adjust to at the beginning, but you get used to it eventually. Time is very depressing after all... Both happiness and sadness fade away with time."
"If you stay hidden like this, you'll be able to get away from the police, however, you will never escape your crime... Madam, are you trying... Are you trying to force your son to carry this burden for the rest of his life?"