As has been discussed, a world dominated by sin and death is falling apart. In physics it is called the Second Law of Thermodynamics, that is to say, things run down, things decay, and fall apart

We are made so that we need rest.

In rest and in sleep, we can repair some of the loss. Even so our ability to repair loss and ruin and decay is limited. If you stick your finger in a fan and knock some of the skin off of your finger, then your body can over time repair that loss of skin, and restore your finger to like new. However, if that fan actually cuts off part of your finger … well … you will never be able to grow back that finger. We do not have that sort of regenerative capability.

And even our senses run down.

In a world dominated by sin and death that is often a good thing. This means if we are surrounded by death and stinking decay, we may at first accurately sense the stink and the filth. It is nauseating, and we can hardly stand it. But if we are forced to stay around the stink, then after a little while our sense of the stinking decay tends to run down. After a little while, it does not bother us quite so bad. In a world dominated by sin and death that can be a good thing, within limits.

It is the same for many of our very stupid mistakes and slip-ups. At first the shame of how dumb we have been is overwhelming. But fortunately that sense of being so shamefully stupid wears off. Thank God! Imagine how bad it would be if we fully and accurately felt that shame and embarrassment forever! That would be hard to bear. So it is in part a good thing that our senses also run down.

Part of the other side of that of course is when we are trying to fully enjoy something that is good or beautiful. Almost all of us have had times when we came across a song or a piece of music that was so beautiful that we could not get enough of it. We played it, we listened to it over and over and over and seemingly could not get enough of it. Even at our best though, after a while our senses run down, and we can no longer enjoy that music as we once did.

In heaven, in the new universe NOT dominated by
sin and death and decay,

we will be able to perfectly enjoy good things forever. We will be purified from all wickedness and decay forever.

And since things will not run down in this
new universe without sin and death,

we will not need and rest.

“but those who wait for Yahweh shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; they shall walk, and not faint.”
Isa 40:28-31 WEB

You would not want to miss it for the world!

WEB is the World English Bible, a copyright free revision
of the original ASV American Standard Version 1901