Kant maintained that we shall never know the real world, or the thing in itself. True, our intelligence is insufficient for comprehending the thing in itself. Yet it is grasped by our instinct, and intuition makes us aware of this knowledge. In other words the philosophy of Homo Faber does not suffice for grasping the real world and we should therefore turn to our instinct. He opposed Darwin's evolution theory, which regards life as a passive process adapting to a random environment.
Darwinian evolution is a mechanical process based on Newton's premises.
Bergson believed that life is more than that. By its vital impetus, or elan vital , life acts on its environment, and evolves with it. The medicine of Homo Faber - Homo Faber applies the tools and concepts of his trade to study life. Our organism may be more than a machine, yet we study it in the same way as machines. Diseases are reduced to genes, and physiology to physico-chemical processes.