Whatever there is of necessity is within him. Nothing is driving him except his original impetus to survive. And he carries that within himself or his group. Within him is the force with which he fends off pain. Within him is the force with which he attracts pleasure.
It chances to be a scientific fact that man is a self-determined organism to the outermost limit that any form of life can be, for he still depends upon other forms of life and his general environment. But he is self-determined. He is not inherently a determined organism in the sense that he is driven on this wonderful stimulus-response basis which looks so neat in certain textbooks, and works so completely unworkably in the world of man. The happy little illustrations about rats do not serve when we are talking about man. The more complex the organism, the less reliably the stimulus-response equation works. And when one reaches that highest complexity, man, he has reached a fine degree of variability in terms of stimulus-response. The more sentient, the more rational an organism, the more that organism is self-determined. Self-determinism, like all things, is relative. Compared to a rat, however, man is very self-determined indeed. This is only a scientific fact because it can easily be proven.
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