Agreed about not outright lying. I think my mom's advice -- the way I interpret it, anyway -- is more "don't volunteer information". Sometimes you have to answer honestly if they ask you a direct question about a concrete fact they can doublecheck in alternative ways, but otherwise: don't volunteer information. Don't be a "completionist", if they ask you "have you ever considered [something naughty]" the truth is only for your therapist; for HR it's always "no, never!".