If you work at it you can think yourself into a bad state of mind. Why get up in the morning if it is all predetermined.
"If" the universe were perfectly deterministic (which can be neither proved nor falsified), nobody would be thinking themselves into anything, because the very act of thinking would be perfectly determined by antecedent activities. The same would be true of whether someone does or does not get up in the morning. In a perfectly deterministic universe, some people would be compelled to seem to believe in the truth of their lacking Free Will, some people would be compelled to seem to believe that they have Free Will, some people would be compelled to seem to believe that they have a compromised form of Free Will, some people would be compelled to not seem to believe anything about the subject, and some people would be compelled to seem to believe that this is an inane subject unworthy of discussion. Among the people who would be compelled to seem to believe that they lack Free Will, some people will be compelled to react to that belief by staying in bed and seeming to be depressed, while others will be compelled to seem to believe that their lack of Free Will is immaterial to living their lives, get out of bed, and seem to wonder at the universe.
As I previously have noted, the most significant difficulty about discussing the nature of the metaphysical paradigm of Determinism is that there is no language that can be used to discuss the paradigm that is fully internally consistent with the paradigm itself, because the truth or validity of the paradigm denies the truth or validity of truth and validity, notions of belief or fact, and the individuality, if not the existence, of the author and the reader, among other things. In a sense, we are prisoners of our language and logic, with no way to communicate or evaluate anything (including the validity or even utility of language and logic) without using them to perform or communicate the evaluation.
I also find that many folks -- more often the advocates of Free Will -- waste their time focusing on the unanswerable question of whether Determinism or Free Will is true, and are incapable of acknowledging even the possibility that the universe operates differently than they believe. In essence, many folks have an unacknowledged faith that they are correct (akin to a faith in an unprovable god) that clouds their ability to consider even the ramifications of a reality in which their faith is misplaced. In that regard, Nicolas Gisin has said:
I know that I enjoy free will much more than I know anything about physics. Hence, physics will never be able to convince me that free will is an illusion. Quite the contrary, any physical hypothesis incompatible with free will is falsified by the most profound experience I have about free will.
Unlike many others, Gisin had the fortitude to acknowledge that his faith in Free Will is based on his feelings and that he would reject, out of hand, any putative falsification of the truth of his feelings.
Gisin also has written:
[F]or me, the situation is very clear : not only does free will exist, but it is a prerequisite for science, philosophy, and our very ability to think rationally in a meaningful way. Without free will, there could be no rational thought. As a consequence, it is quite simply impossible for science and philosophy to deny free will.
In other words, Gisin is further unwilling to accept the possibility that Free Will does not exist, because doing so topples the empirical paradigm of science.
Anton Zeilenger has similarly stated:
The second important property of the world that we always implicitly assume is the freedom of the individual experimentalist. This is the assumption of free will. It is a free decision what measurement one wants to perform. In the experiment on the entangled pair of photons, Alice and Bob are free to choose the position of the switch that determines which measurement is performed on their respective particles. It was a basic assumption in our discussion that that choice is not determined from the outside. This fundamental assumption is essential to doing science. If this were not true, then, I suggest, it would make no sense at all to ask nature questions in an experiment, since then nature could determine what our questions are, and that could guide our questions such that we arrive at a false picture of nature.”
As I read these quotes, they reflect that Gisin and Zeilinger (who are relatively representative of other storied physicists) both (i) accept on faith that Free Will exists based on their "feeling" of having Free Will, and (ii) are intellectually unwilling to accept the possibility that Free Will does not exist, because doing so topples their own empirical paradigm of science. Within science, itself, however, neither feelings nor fear can serve as valid basis for scientific conclusions.
Being less versed in physics, and far less erudite than Gisin and Zeilinger, I approach the issue as follows:
Science (like Determinism) is, itself, a metaphysical paradigm, which is built in the premise that there is an ultimate reality that is capable of being discerned through the empirical method. As explained at a somewhat high level in the
Stanford Encyclopedia of Philosophy, metaphysical propositions about ultimate reality (including propositions that there is no ultimate reality) cannot be proved or falsified by science and may well be beyond the capacity of human beings to prove or falsify. As a metaphysical paradigm about ultimate reality, Determinism can be accepted or rejected only on faith. The same is true of science and religion, which are alternative metaphysical propositions that can be tested only for validity or invalidity (as opposed to truth or falsehood) based upon internal consistency — and even that depends upon assuming that there is an ultimate reality and that the rules of logic are consistent with that reality. Yet another way to consider the issue is through the mystical eyes of Swami Vivekananda, who wrote that “[e]very attempt to solve the laws of causation, time, and space would be futile, because the very attempt would have to be made by taking for granted the existence of these three.” Plainly, science cannot pull itself up by its own bootstraps. Nor can science pull out its bootstraps and trip up Determinism.
If Determinism were true (which we cannot know for many of the same reasons that Determinism cannot be falsified), any putative proof to the contrary would be nothing more (or less) than the natural consequence of prior activity that has the illusory appearance of being correct and/or reliable — such as science, itself. If Determinism were true, we could not trust our thoughts to be representative of reality, because our thoughts simply would be the necessary effects of prior activity in the universe and would be the only thoughts we could have. If Determinism were true, and our thoughts did correlate with reality, it would be purely by happenstance. If Determinism were true, our thoughts — including our belief in and reliance upon science — simply would be meaningless noise in the universe.
I believe the foregoing is consistent with the observations of Gisin and Zeilinger that rejecting the existence of Free Will fundamentally undermines science, philosophy and reasoning, itself.
In a world governed by science, we do not think of a speck of dust blowing in the wind as having any control over its actions. The dust does not decide which way it will be blown, and it does not question the wind that blows it or other things into which it comes into contact as it is blown from place-to-place. If Determinism were true, then human beings, as well as their thoughts and conventions (including science), would be no more than dust in the wind — incapable of providing proof of anything.