Vatican Clarification on Filioque
[…] We grant that the Holy Spirit proceeds principally from the Father, in the technical sense. That means, the Father is his principal without principal. It is not that the Spirit proceeds “less” from the Son. But that the Son, his principal, is himself from a principal. In short, the teaching here shores up the monarchy of the Father.
But it is odd to say that the HS proceeds from the Father alone in a “proper” manner. Is this opposed to an “improper” manner? Does it mean the term “proceeds” should not be linked to the Son? Does it mean that “proceeds” means only coming from an ultimate principal? Why then should the document include the expression “proceeds (ekporeuetai) from the Father through the Son?” Wouldn’t that be oxymoronic? Or is “proper” simply a redundant synonym for “principal”? These are questions. […]