Someone told me that I'm one of the most truthful persons she ever knew, because she never caught me lying. Small wonder. I only lie if I'm dead sure that I won't be caught. That's not very often, but it happens.
What I find much more disturbing about veracity is the damned nuisance that it often takes so much time to tell all of the truth. The better one understands the longer it takes to explain. It often happened to me that I could only tell a scrap of the truth because there was just not enough time to be heard out or to think up a balanced summary. To say "I can't tell in five minutes, and won't try" is also not satisfying.
A bent towards veracity is a curse.