Composition
"Holy, Holy, Holy! Lord God Almighty" (1826) was written by Reginald Heber (1783-1826), Bishop of Calcutta, specifically for Trinity Sunday - the liturgical feast celebrating the doctrine of the Trinity. Set to John Bacchus Dykes's tune "Nicaea" (1861), named after the Council of Nicaea (325 AD) that defined Trinitarian doctrine, the hymn represents the most complete statement of Trinitarian theology in English hymnody. Heber died in Calcutta at age forty-three, having served as Bishop only three years; this hymn is his most enduring legacy.
Biblical Text
Revelation 4:8 - "Holy, holy, holy is the Lord God Almighty, who was, and is, and is to come" - provides the text that the hymn's structure expands. The heavenly creatures' unceasing song becomes the pattern for human worship: the Trisagion of Revelation 4 is the celestial reality of which the congregation's Sunday morning singing is a temporal participation.
Isaiah 6:3 - "Holy, holy, holy is the LORD Almighty; the whole earth is full of his glory" - is the Old Testament parallel, the seraphic song in Isaiah's throne-room vision that the Revelation text explicitly echoes. The theological connection between the two thrones - Isaiah's Temple vision and John's heavenly vision - is enacted in the hymn's structure: both reveal the same God, worshipped by the same Trisagion.
The Trinitarian structure of the hymn - Father ("God in Three Persons"), Son (the second stanza's reference to all works of creation), and Spirit (explicitly named in the fourth stanza) - works through the Nicene Creed's theology while remaining doxological rather than didactic: it praises rather than argues.
Creator and Legacy
The tune "Nicaea" is among Dykes's finest compositions, its stately dignity and harmonic richness matching Heber's text perfectly. The hymn is widely regarded as the greatest hymn of Trinitarian theology in English and as one of the most theologically substantial hymns in any language. It is sung at Trinity Sunday services, at ordinations, and at any occasion requiring a comprehensive statement of praise to God as Trinity. Its combination of celestial imagery (joining the seraphic chorus of Isaiah and Revelation) and doctrinal precision (naming all three Persons) makes it unique in the hymn repertoire.