substance, to which these modes belong in that peculiar manner which I before mentioned.
I am, Sir,
Your affectionate Friend and Servant.
December 10, 1713.
THE FOURTH LETTER.
Reverend Sir,—Whatever is the occasion of my not seeing the force of your reasonings, I cannot impute it to (what you do) the want of clearness in your expression. I am too well acquainted with myself to think my not understanding an argument a sufficient reason to conclude that it is either improperly expressed, or not conclusive; unless I can clearly show the defect of it. It is with the greatest satisfaction I must tell you, that the more I reflect on your first argument, the more I am convinced of the truth of it; and it now seems to me altogether unreasonable to suppose absolute necessity can have any relation to one part of space more than another; and if so, an absolutely necessary Being must exist everywhere.
I wish I was as well satisfied in respect to the other. You say,—All substances, except the self-existent one, are in space, and are penetrated by it. All substances, doubtless, whether body or spirit, exist in space: but when I say that a spirit exists in space, were I put upon telling my meaning, I know not how I could do it any other way than by saying, such a particular quantity of space terminates the capacity of acting in finite spirits at one and the same time, so that they cannot act beyond that determined quantity. Not but that I think there is somewhat in the manner of existence of spirits in respect of space, that more directly answers to the manner of the existence of body; but what that is, or of the manner of their existence, I cannot possibly form an idea. And it seems (if possible) much more difficult to determine what relation the self-existent
