I say this statement in the sense of software development. If a software application’s engine is a soul, then the user interface will be the body. You have a good engine, but without a good user interface, people will not use the engine that much, cause not everybody see the soul without looking at the body.
So, if the engine and the user interface is a soul, then packaging will be the body. Your software application has a graphical user interface with a good engine, but they are not packaged. However, package it, so that the user can install and uninstall easily, then, everything will be better.