Security, cf. eternal security
During initial construction on the Golden Gate Bridge, no safety devices were used and 23 men fell to their deaths. For the final part of the project, however, a large net was used as a safety precaution. At least 10 men fell into it and were saved from certain death. Even more interesting, however, is the fact that 25% more work was accomplished after the net was installed. Why? Because the men had the assurance of their safety, and they were free to wholeheartedly serve the project.