Honesty involves two fundamental requirements. The first, and most obvious, is doing everything in one's power to be true to ones word. The second is to do everything in one's power to be true to oneself, to be authentic.
To be authentic in a given situation, our motives need to line-up with the goals we are trying to pursue, and the goals we are trying to pursue need to be (within reason) attainable. If we set goals that are not attainable, then we are living in a dream world. And, if we are motivated to do something that is not stated in the goals we express, we run the risk of being manipulative.