What does the Ace of Swords mean?
Here is a pithy meaning for the Ace of Swords:
Less is more.
Today’s pithy meaning is, appropriately enough, very pithy. It is similar to both of the following meanings, which are equally pithy:
Brevity is the soul of wit.
Follow the KISS principle.
KISS stands for “Keep It Simple, Stupid” which means that systems are best designed as simply as possible. Avoid all extraneous complexity. It also is a common principle in presentations (either oral or written). In that case, it may suggest that you should make a presentation as easy to understand as possible. Incidentally, Albert Einstein is purported to have said, “Make everything as simple as possible, but not simpler.”
These are all just rules of thumb, of course, as evidenced by the ironic fact that I have been rather verbose in my explanation here.
PS: When considering our understanding of something (rather than our explanation or creation of something), we might use the following as a pithy meaning:
Use Occam’s razor.
This basically means that the simplest explanation is probably the right one.