Here's the deal: if you give me your email address, I'll make sure I never show you the same "Random" quotation twice.
There's no password; all you need to "Log in" is your email address. Which is also all you need to "Register". So, if you're thinking that "Register" and "Log in" are actually synonyms, here, you're right on the money.
I'm only using your email address to identify you, and remember what quotations you've looked at.
I will not to send you any email, ever. I won't even send you a confirmation email.