The Holy Spirit, as regards His existence, proceeds only from the Father. That is the most fundamental revealed truth about the Spirit and the dogma of the Church of the Seven Councils. There is only one cause of the Spirit, the Father, who is the cause of everything and all, just as the Father is the cause of the Son.
As far as I know the Latin Church does not teach double origin. The Father is the source of both the Son and the Spirit.
The Greek word used for proceed is ekpouremai, which, unlike the Latin translation, implies origin.
The Catholic-Orthodox dialogue, some years back, pretty much settled this issue by acknowledging the above. The Orthodox agree that the Spirit is sent by the Father as well as the Son, that Both share the same Spirit (this is made perfectly clear in the Palamite doctrines that pretty much represent official Orthodox teaching), but it is of utmost importance to realize that the Father is the source of the Spirit as far as His existence is concerned, and that the Son is not the source; double origin or double source is not the doctrine of the Church, never was and never will be. It is extremely important to distinguish the source of existence of the Spirit as being only the Father, thus preserving the monarchy of the Father.
Dear Kosta, thanks for your response in post #10954.I have been very busy and doing some catch up
I wish you a Blessed Evening