[An] example of the hubris of contemporary science is the rigorous banishment of the word "purpose" from its vocabulary. This is probably an aftermath of the reaction against the animism of Aristotelian physics, where stones accelerated their fall because of their impatience to get home, and against a teleological world-view in which the purpose of the stars was to serve as chronometers for man's profit. From Galileo onward, "final causes" were relegated into the realm of superstition, mechanical causality reigned supreme. ...The mechanistic universe gradually disintegrated, but the mechanistic notion of causality survived until Heisenberg's indeterminacy principle proved its untenability.
With Heisenberg's uncertainty principle, the fundamental role of experimental errors became a basic feature of physics.léon brillouin