Change

There's this saying that the only thing constant is "change" itself.

Sounds cliche, but do you agree?

How about Plank constant? Gravity of 9.81 ms(2) ?. Yes, this might get changed if you're somewhere else in the universe. Time and space are our friends. Wherever, whenever, you'll be experiencing something else.

Since change happens at any point of space and time, change will always occur relatively. And because we're either moving in time or space, or both, change will always happen. Since change will always happen at any point, change itself is the constant.

Then you'll go - "wait a second. This make no sense".
This is like saying changes in, say, variable "x", is itself a constant. But "x" doesn't have any absolute value.! You can't possibly say that it's a constant.

OK, let me tell you this - do you agree that the gravity constant g is only constant on the planet earth? So how can you claim that it is a constant when we can define another g that refers to gravity on the moon? Which has a different value?

The thing is, you can't have a real constant. You can only have a constant relative to some reference point. We don't have any real constant because the universe itself is changing.

To say that the only constant is "change" can be confusing at best, but what essentially the message is that - things around us are changing, whether we ourselves make any effort to change or not.

What's the lesson? Change, or be changed.