No greater care is required upon any works than upon such as are to withstand the action of water; for this reason, all parts of the work need to be done exactly according to the rules of the art which all workmen know, but few observe.
Frontinus
2.
I will ignore all ideas for new works and engines of war, the invention of which has reached its limits and for whose improvement I see no further hope.
Frontinus
3.
Inventions reached their limit long ago, and I see no hope for further development.