Full Idea
If causal relations are the manifesting of powers, then causal relations would appear to be a species of internal relation.
Gist of Idea
If causal relations are power manifestations, that makes them internal relations
Source
John Heil (The Universe as We Find It [2012], 07.4)
Book Reference
Heil,John: 'The Universe as We Find It' [OUP 2012], p.148
A Reaction
The point being that any relations formed are entirely dependent on the internal powers of the relata. Sounds right. There are also non-causal relations, of course.