There are Haibara's quotes:
“You can't complain about time going by... If anyone tries to change it... Life will punish them.„
— File 191, Page 11: "The Eyes From Far Away"

“Creation reflects the inner state of the creator.„
— File 335: "Memento of a Wife"

“Don't judge people from the outside. Like any rose has thorns, the more person appears nice on the outside, the more you should doubt the inside.„
— File 461: "Poison on the Bait!?"

Specific
“Using too much of your brain can make you bald like Professor Agasa..„
— File 222, Page 7: "The Last Movie"

“Even this loyal mirror won't reflect your true form.    „
— Talking to Conan, File 223, Page 14: "The True in the Mirror"

“You'll protect me, right?    „
— Talking to Conan, File 346: "The Fake Supporter"

“I will pass!„
— When the Detective Boys want to play detectives or treasure hunters

Megumi Hayashibara's favorite line as Ai Haibara, indicated in Conan radio.
“Baka! (Fool)