Man is a being purely physical.
Man's life is a line that Nature commands him to describe upon the surface of the earth, without his ever being able to swerve from it, even for an instant. He is born without his own consent, his organisation does in no wise depend upon himself, his ideas come to him involuntarily, his habits are in the power of those who cause him to contract them, he is unceasingly modified by causes, whether visible or concealed, over which he has no control, which necessarily regulate his mode of existence, give the hue to his way of thinking and determine his manner of acting. I deny that freedom exists at all. I must deny it or my programme would be absurd. You can't have a science about a subject matter that hops capriciously about.