“from the Son” and “through the Son” are theological opinions which were dogmatized prematurely and erroneously. There is no dogma of the relation of the Holy Spirit to the Son and therefore particular opinions on this subject are not heresies but merely dogmatic hypotheses, which have been transformed into heresies by the schismatic spirit that has established itself in the Church and that eagerly exploits all sorts of liturgical and even cultural differences" (emphasis in the original).
Sergei Nikolaevich Bulgakov, The Comforter (Wm. B. Eerdmans 2004 ISBN 0-8028-2112-X), p. 148