As a young Anglican vicar, Reginald Heber (1783-1826) wrote his own hymns to tie in with the various Sundays of the church year. "Holy, Holy, Holy," which Alfred Lord Tennyson called the world's greatest hymn, was written by Heber for Trinity Sunday, celebrated eight weeks after Easter.
Heber was continually impressed with the holiness of God, and he calls all of the saints and angels to worship God in response to it. Though sinful people cannot see the glory of God, he alone is truly holy and perfect. Once you have read these words, take a moment to bow in silence before our holy God.
Holy, holy, holy! Lord God Almighty!
Early in the morning our song shall rise to Thee;
Holy, holy, holy! merciful and mighty!
God in three Persons, blessed Trinity.
Holy, holy, holy! all the saints adore Thee,
Casting down their golden crowns around the glassy sea;
Cherubim and seraphim falling down before Thee,
Which wert and art and ever more shalt be.
Holy, holy, holy! though the darkness hide Thee,
Though the eye of sinful man Thy glory may not see;
Only Thou art holy--there is none beside Thee,
Perfect in pow'r, in love and purity.
Holy, holy, holy! Lord God Almighty!
All Thy works shall praise Thy name in earth and sky and sea;
Holy, holy, holy! merciful and mighty!
God in three Persons, blessed Trinity!
(from the Praise and Worship Study Bible)