Full Idea
The necessitated is not always a result or consequence of the necessitator. If p-and-q is a fact, then this necessitates that p, but the fact that p need not be a result or consequence of the fact that p-and-q.
Gist of Idea
The necessitated is not always a result or consequence of the necessitator
Source
Ernest Sosa (Varieties of Causation [1980], p.242)
Book Reference
'Causation', ed/tr. Sosa,E. /Tooley,M. [OUP 1993], p.242
A Reaction
This is obviously correct, and needs to be borne in mind when considering necessary causation. It is not enough to produce a piece of logic; something in the link from cause to effect must be demonstrated to be necessary.