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I was married to a liar for 25 years. At a very personal level, I have first-hand knowledge of the devastation lying creates in people's lives. I know that liars can be clever, charming, smug, and thoroughly convincing. There is a reason for their lying. In my case it was to hide a very big secret.
But to me, eschewing assumptions has been a way of life. For example, to this day, while driving, I never, ever cruise breezily through a green light. Instead, I follow a lesson I have passed onto both of my sons: "Just because the other guy has the red light, don't assume he's stopping at it."