Every other sentence in a work of literature which is endeavouring truly to interpret the facts of experience expresses differences in surrounding events due to the presence of some object.

An object is ingredient throughout its neighbourhood, and its neighbourhood is indefinite.

Also the modification of events by ingression is susceptible of quantitative differences.

Finally therefore we are driven to admit that each object is in some sense ingredient throughout nature; though its ingression may be quantitatively irrelevant in the expression of our individual experiences.
This admission is not new either in philosophy or science.

It is obviously a necessary axiom for those philosophers who insist that reality is a system.