When St Basil was attempting to define the hypostatic qualities of the Holy Spirit, he could find no other words than hagiasmos or hagiosyne, meaning “sanctification” or “holiness.” It is difficult, therefore, to speak of the Spirit without taking into account his work of sanctification, but it is no less difficult to speak of the Church’s holiness without evoking the Holy Spirit, the source and power of sanctification. It sheds light on the whole final section of the Creed: the communion of saints, the remission of sins, the resurrection of the body and eternal life. Sanctification is not only moral sanctification, it is the sharing of divine life, of eternal life, of the resurrection. It is the very mark of the Spirit on the flesh itself, on all of human nature, the gift of incorruptibility, of deification.
Father Boris Bobrinskoy, The Mystery of the Church: A Course in Orthodox Dogmatic Theology, 133.
I haven’t started reading this book properly yet, but was looking through it today, came across this, and thought it worth sharing!