His principal work, published in 1954, bore the French title "La technique" and tackles the problem that Dewey addressed in 1929: a culture in which the authority of evolving technology destroys traditional valuations without creating legitimate new ones. Both men agree that conditionally-efficient valuations ("what is") become irrational when viewed as unconditionally efficient in themselves ("what ought to be"). However, while Dewey argues that contaminated instrumental valuations can be self-correcting, Ellul concludes that technology has become intrinsically destructive. The only escape from this evil is to restore authority to unconditional sacred valuations: