Chapter VII, Footnote #09
The etymology of the word circumstance is perfectly characteristic of its import: circum stantia, things standing round: objects standing round a given object. I forget what mathematician it was that defined God to be a circle, of which the centre is every where, but the circumference no where. In like manner the field of circumstances, belonging to any act, may be defined a circle, of which the circumference is no where, but of which the act in question is the centre. Now then, as any act may, for the purpose of discourse, be considered as a centre, any other act or object whatsoever may be considered as of the number of those that are standing round it.