4 corners, 4 walls
So if 4's means things are too stable what do you say about 8's, Thirteen? I was thinking that actually the 8's of each element doesn't show lack of movement or pause
Well, first, not all 4's are "too stable." The "too stable" 4's are the ones with elements that are already inclined to be quiet (Water/Earth). They stay still and you might not be able to get them moving again. But 4/Wands and 4/Swords benefit from that moment of stillness because they're always on the move. The foundation--4/corners--has been laid down and one can pause to enjoy that before moving onto the next step.
As for the 8's, well, if you've got 4 corners the next four things you're likely to create are walls. Walls limit you--but they also protect you. The 8's are about the benefits or detriments of those walls, of rules or working within limitations. We have a negative reaction to the word "rules" and limits--but rules and limits are not always bad things--consider how rules on air and water keep both clean for us, and even inspire people to be inventive, like creating solar and wind energy. Consider the wild kid with no focus who goes into the army and thrives on finally having rules to follow.
Thus, in the 8/Pents, the person learns discipline, a work ethic that makes him productive. In the 8/Wands the energy is focused and suddenly moves incredibly fast because it it channeled in a narrow way rather than spreading out all over the place. 8/Cups is sometimes viewed as the "morning after" card. Meaning you finally get tired of indulging and decide to sober up (I, personally, like to see it as "leaving the drama" of all those emotions). And then there's the opposite side--8/Swords. Too many limits on speech and thought can make you feel afraid to say or think anything.
What you have to remember is that what the card number stands for (4 = stability) will have a different effect on each suit. It makes no sense after all for "stability" to have the same effect on Pentacles (Earth) as it does on Swords (Air). Likewise for the 8's. Limitations create a different result for each suit.
Yes?