The Holy Spirit
The Lord, the Giver of Life
Orthodoxy confesses the Holy Spirit as fully divine, proceeding from the Father, worshiped and glorified with the Father and the Son.
What the Church teaches
The Holy Spirit is not an impersonal force or a lower divine influence. He is the Lord, the Giver of Life, who proceeds from the Father and is worshiped and glorified together with the Father and the Son.
The biblical witness
Christ promises the Spirit of truth, who proceeds from the Father and bears witness to the Son. At Pentecost the Spirit descends upon the Apostles, and throughout Acts He guides, sends, sanctifies, and fills the Church.
The councils & the Fathers
Constantinople I confessed the divinity of the Spirit against those who denied it. St Gregory the Theologian and St Basil defended the Spirit's full place in the divine life and in Christian worship.
Why it matters
Without the Spirit, the Church becomes an institution without breath. The Spirit gives life, sanctifies the faithful, makes Christ present in the sacraments, and preserves the Church in the apostolic faith.
Common misunderstandings
The Filioque controversy is not a small wording dispute. Orthodoxy rejects the unilateral addition to the Creed and maintains the monarchy of the Father: the Spirit proceeds from the Father, while being sent and manifested through the Son.
Go deeper
Read this tract with Triadology, Ecclesiology, and the Pentecost timeline entry. The Spirit's work in the Church is inseparable from the Church's worship and sacramental life.