My grandparents believed that you were either honest or you were not. There was no middle ground. They had a simple saying hanging on their living-room wall: "Life is like a field of newly fallen snow. Where I choose to walk every step will show." They didn't have to talk about it; they demonstrated this truth in their lifestyle.
They understood instinctively that integrity involves having a personal standard of morality and boundaries that does not sell out to convenience and that is not relative to the situation at hand. Integrity is an inner compass for judging your behavior.