Took me awhile to get the gist of this line from Star Trek 3 (the original ST3, I might add). After many Google searches, I’ve only found a few meanings that I was looking for and then my INFJ had kicked in and I’d discovered that this was very self-explanatory to say the least.
Long story short, I’ll give the short version.
The key words are: “overthink” and “stop up”. They go hand in hand (or “six in one, half-dozen the other”). But after meditating on that line from ST3, it dawned on me that when one overthinks a situation, he/she gives more attention to a situation than needed, or productive. And as a result, overthinking a matter “stops up”, or hinders further progress from other important things that could be accomplished.
In other words, don’t pay so much attention to one thing that you lose sight of the other things, and you hold up your own progress, or the progress of others.
Hence the adage posted.
The beauty of this is this can be taken both in a figurative, and literal sense.
And there are some principles in The Bible that complements this as well. Maybe I’ll touch on them later.