Sentence:  Hence, ... whatsoever perfections or properties (except such as are purely personal) are attributed to any of these divine Persons, are the same in all, and may equally be attributed to every one; they being all and every one the same God, in whom all perfections <WSD>concentre</WSD>, or, rather, who is all perfection itself. 
Meaning of the word marked with <WSD> tags:  To come together at a common centre.