Motion in one body is regarded upon impulse as the cause of motion in another.

When we consider these objects with utmost attention, we find only that the one body approaches the other; and that the motion of it precedes that of the other, but without any, sensible interval.

It is in vain to rack ourselves with farther thought and reflection upon this subject.

We can go no farther in considering this particular instance.
Should any one leave this instance, and pretend to define a cause, by saying it is something productive of another, it is evident he would say nothing.

For what does he mean by production?
Can he give any definition of it, that will not be the same with that of causation?
If he can; I desire it may be produced.