The thought experiment suggested not only that it comes natural to us to think of ourselves as exercising free will in our decision-making and in our actions, but also that we find it practically impossible to imagine a life in which we don’t exercise free will. Even if we became intellectually convinced that everything is predetermined, we wouldn’t know what it would mean to just lay back and allow ourselves to do what we are predetermined to do.
We then looked at the role of our rationality, our ability to perceive and act on reasons, as the mechanism that makes determinism work for human beings and that provides the feeling of exercising free will. In this way of looking at it, our ability to perceive certain things as reasons for actions, our sensitivity to certain kinds of reasons for action, our capability to act on them and the reasons themselves are always already given.
Seeing our rationality as that mechanism explains an important phenomenon: the idea that knowing or coming to believe that determinism is a fact of our life can be in some way helpful to us.
At a first glance, it is hard to see how that idea would make sense. If we believe in determinism or know it to be true, it is hard to see how we could use that belief or knowledge to influence the course our life takes. After all, we are intellectually committed to the idea that we have no control over the way our lives turn out. And yet a number of philosophers and schools of thought teach something along the lines of: given determinism, we should live in such-and-such a way.
This makes better sense if rationality is involved in the way in which the predetermined course of events unfolds with human beings. Then the knowledge or belief in determinism can itself become a reason for certain actions or to act in certain ways for those human beings who come to believe in it.
So, for example, a human being who has become convinced that determinism runs his or her life, can take that as a reason not to get too upset if things don’t go his or her way. Or if I think that determinism is at the foundation of other people’s behaviours, that knowledge can become a reason for me not to react too strongly to any perceived slights, bad behaviour or unpleasantness from others.