The great liability of the engineer compared to men of other professions is that his works are out in the open where all can see them. His acts, step by step, are in hard substance. He cannot bury his mistakes in the grave like the doctors. He cannot argue them into thin air or blame the judge like the lawyers.

The quote by Herbert Hoover, "The great liability of the engineer compared to men of other professions is that his works are out in the open where all can see them. His acts, step by step, are in hard substance. He cannot bury his mistakes in the grave like the doctors. He cannot argue them into thin air or blame the judge like the lawyers," highlights the unique accountability engineers face in their profession. Hoover points out that unlike professions like medicine or law, where mistakes may be more abstract or hidden, an engineer’s work is tangible and observable. The physical products of their labor, whether bridges, buildings, or machinery, make any error visible and often difficult to rectify.

The origin of this quote comes from Hoover’s recognition of the high level of responsibility that engineers bear, particularly because their decisions can have real, visible consequences. Hoover, who himself had a background in engineering, was acutely aware of the weight that rests on the shoulders of those who design and build the infrastructure of modern society. His words draw attention to how the work of engineers is constantly scrutinized because of its physical presence in the world, unlike professions where mistakes might not be as directly noticeable.

Hoover’s comparison between the engineer and other professionals like doctors and lawyers serves to highlight the transparency and permanence of an engineer’s actions. While a doctor may be able to mask the outcomes of a mistake or a lawyer may be able to present counterarguments, an engineer’s errors often remain evident in the structures or machines they create. This makes the engineer's job inherently more pressured, as each design or project carries a significant weight of scrutiny from both the public and their peers.

Ultimately, Hoover’s quote underscores the vulnerability that comes with the engineering profession. The work done by engineers is not just intellectually demanding but is also constantly exposed, requiring them to be meticulous and precise in their designs. The permanence of their creations—along with the scrutiny that accompanies them—makes their role distinct in the realm of professional responsibility.