Free will is an idle fancy

Theologians tell and repeat to us that man is free, while all their teachings conspire to destroy his liberty. Trying to justify Divinity, they accuse him really of the blackest injustice. They suppose that, without grace, man is compelled to do evil: and they maintain that God will punish him for not having been given the grace to do good! With a little reflection, we will be obliged to see that man in all things acts by compulsion, and that his free will is a chimera, even according to the theological system. Does it depend upon man whether or not he shall be born of such or such parents? Does it depend upon man to accept or not to accept the opinions of his parents and of his teachers? If I were born of idolatrous or Mohammedan parents, would it have depended upon me to become a Christian? However, grave Doctors of Divinity assure us that a just God will damn without mercy all those to whom He has not given the grace to know the religion of the Christians.

Man's birth does not depend upon his choice; he was not asked if he would or would not come into the world; nature did not consult him upon the country and the parents she gave him; the ideas he acquired, his opinions, his true or false notions are the necessary fruits of the education which he has received, and of which he has not been the master; his passions and his desires are the necessary results of the temperament which nature has given him, and of the ideas with which he has been inspired; during the whole course of his life, his wishes and his actions are determined by his surroundings, his habits, his occupations, his pleasures, his conversations, and by the thoughts which present themselves involuntarily to him; in short, by a multitude of events and accidents which are beyond his control. Incapable of foreseeing the future, he knows neither what he will wish, nor what he will do in the time which must immediately follow the present. Man passes his life, from the moment of his birth to that of his death, without having been free one instant. Man, you say, wishes, deliberates, chooses, determines; hence you conclude that his actions are free. It is true that man intends, but he is not the master of his will or of his desires. He can desire and wish only what he judges advantageous for himself; he cannot love pain nor detest pleasure. Man, it will be said, sometimes prefers pain to pleasure; but then, he prefers a passing pain in hope of procuring a greater and more durable pleasure. In this case, the idea of a greater good determines him to deprive himself of one less desirable.

...But man, say you, can resist his desires; then he is free. Man resists his desires when the motives which turn him from an object are stronger than those which draw him toward it; but then, his resistance is necessary. A man who fears dishonor and punishment more than he loves money, resists necessarily the desire to take possession of another's money. Are we not free when we deliberate?--but has one the power to know or not to know, to be uncertain or to be assured? Deliberation is the necessary effect of uncertainty in which we find ourselves with reference to the results of our actions. As soon as we believe ourselves certain of these results, we necessarily decide; and then we act necessarily according as we shall have judged right or wrong. Our judgments, true or false, are not free; they are necessarily determined by ideas which we have received, or which our mind has formed. Man is not free in his choice; he is evidently compelled to choose what he judges the most useful or the most agreeable for himself. When he suspends his choice, he is not more free; he is forced to suspend it till he knows or believes he knows the qualities of the objects presented to him, or until he has weighed the consequence of his actions. Man, you will say, decides every moment on actions which he knows will endanger him; man kills himself sometimes, then he is free. I deny it! Has man the ability to reason correctly or incorrectly? Do not his reason and his wisdom depend either upon opinions that he has formed, or upon his mental constitution? As neither the one nor the other depends upon his will, they cannot in any wise prove his liberty.

...But you will say, "I feel myself free." It is an illusion which may be compared to that of the fly in the fable, which, lighting on the shaft of a heavy wagon, applauded itself as driver of the vehicle which carried it. Man who believes himself free, is a fly who believes himself the master-motor in the machine of the universe, while he himself, without his own volition, is carried on by it. The feeling which makes us believe that we are free to do or not do a thing, is but pure illusion. When we come to the veritable principle of our actions, we will find that they are nothing but the necessary results of our wills and of our desires, which are never within our power. You believe yourselves free because you do as you choose; but are you really free to will or not to will, to desire or not to desire? Your wills and your desires, are they not necessarily excited by objects or by qualities which do not depend upon you at all?

- Paul Henri Thiry, Baron d'Holbach writing as Jean Meslier

My personal note: I personally feel that such remarkable sociological and psychological insight is remarkable from a text written in this era.