People backslide.They freely do things they believe it would be best on the whole not to do -- a judgment developed from their own point of view, not just the perspective of their peers or their parents. The aim of this book is to to clarify the nature of backsliding - of actions that display some weakness of will -- using traditional philosophical techniques that date back to Plato and Aristotle (whose work on weakness of will or "akrasia" he discusses)...