Truth without grace is cruelty. Grace without truth is sentimentality and zero accountability. There has to be a balance between the two. But I think you're leave it overly ambiguous whether you believe that choosing not to say whatever random thought pops into your head is lying. It is most certainly not. Just because you choose not to say something or to temper the way you say it doesn't mean you're lying. In fact, it means that you're sensitive to the fact that your version of events is more likely to be strongly controlled by emotion and atmosphere rather than reason or logic. The truth transcends how one feels about any given situation, and frankly I think people could use a little more practice at self-restraint and remembering that we were given two ears and only one mouth for a reason.