It is pushing a person or a machine beyond its natural limits.

The desires are as great, but the natural limits greater.

Maybe once you develop that, there would be no natural limit.

"So that sets a sort of natural limit," the other went on.

The natural limit to that process is now on the horizon.

But I see no profit in struggling to live beyond one's natural limits.

That puts a natural limit on what they're willing to spend.

This imposes a natural limit on what we can do.

But the desire for higher quality has no natural limits.

There must be a natural limit to how many people this planet will support.