Motivations

Why do we make assumptions about other people's motivations? We're always assuming what's behind people's actions, words, behaviors, attitudes. We think we know where they're coming from...but do we? Most of us have experienced times when other people made assumptions about our own motivations that were incorrect (sometimes slightly, sometimes blatantly). I wonder how often we do that to others? I wonder how often I do this myself? Maybe even recently. Hmm...