From Dr. Hurd:

You can best predict a person's behavior by behavior displayed in the past. Keep the focus on behavior -- not words. This is because very few people have strong integrity. By "strong integrity" I mean when a person's words and actions almost always match. The more eloquent the words, and the more those words animate your values and beliefs, the more careful you should be to match the words to actions. People who tend to act one way in one kind of situation will, over time, tend to act the same way in future situations regardless of words or claimed ideas.