I do not think that this limitation is based on any set purpose or theory.

It merely arises from the fact that more complicated relations are a bother to people without adequate mathematical training, when they are admitted into the reasoning.
I must repeat that we have nothing to do in these lectures with the ultimate character of reality.

It is quite possible that in the true philosophy of reality there are only individual substances with attributes, or that there are only relations with pairs of relata.

I do not believe that such is the case; but I am not concerned to argue about it now.

Our theme is Nature.