Do we have to understand it? Do we understand why 2 + 2 = 4?
The important point is 2+2 necessarily = 4.
A brute fact?
So it is with all Naturals (universal laws). We may not fully understand the why of gravity, but the fact remains that today gravity permeates the universe and has done so since the beginning. We can observe the effects of gravity wherever we look. Thus one thing is sure, gravity is alive and well today, which gives it “gravitas” as opposed to speculation if gravity can or will disappear tomorrow.
The gravitas comes from the belief that it can’t change or at least it can’t change without a reason. Or at the very least it’s highly unlikely to change. The gravitas does not come from simply it hasn’t changed.
There’s the rub, as far as we can tell it will not change without a “reason to change”. I can’t come up with a reason why gravity should change from how it functions today. Can you?
Why do we need to pose the why as if some sort of motive is required for something to function?
Because if there is no reason why, gravity is a contingent brute fact. If it’s a contingent brute fact we seem to get a very perculiar result. Gravity might change at 9 am tomorrow and it might not, there is no reason that pushes the probability either way and so the probability is 50/50. Same goes for 9.30 am, 10 am and so on.
So we end up with, it is highly likely that gravity will change tomorrow.
I would not call it “a contingent brute fact”. I would call it “inherent property or ability” (potential). Today, tomorrow for eternity, Gravity is contingent only on the very existence of the universe itself and vice versa.
This why it is a Universal, a latent dynamic excellence of the Cosmos.