Calvin and Hobbes by Bill Watterson for November 01, 1993
Calvin: You say, when you become a father, you get a book that explains everything in the world? Dad: Right. Calvin: Can I see it? Dad: Nope, sorry. Calvin: Why not? Dad: It tells what it's like to raise a kid. Calvin: So?! Dad: You're not allowed to know that until it's too late not to have one.