Holy Holy Holy Lord of Sabaoth Liturgical Prayer | Red Seraphim Wings with Crosses | Orthodox Christian T-Shirt

This, so far as I know, is the first Order of Celestial Beings which are established about God, immediately encircling Him: and in perpetual purity they encompass His eternal Knowledge in that most high and eternal angelic dance, rapt in the bliss of manifold blessed contemplations, and irradiated with pure and primal splendours.

They are filled with divine food which is manifold, through the first-given outpouring, yet one through the unvaried and unific oneness of the divine banquet; and they are deemed worthy of communion and co-operation with God by reason of their assimilation to Him, as far as is possible for them, in the excellence of their natures and energies. For they know pre-eminently many divine matters, and they participate as far as they may in Divine Understanding and Knowledge.

Wherefore theology has given those on earth its hymns or praise in which is divinely shown forth the great excellence of its sublime illumination. For some of that choir (to use material terms) cry out as with a voice like the sound of many waters, 'Blessed is the Glory of the Lord from His Place'; others cry aloud that most renowned and sacred hymn of highest praise to God, 'Holy, holy, holy, Lord God of Sabaoth, the whole earth is full of Thy Glory!'

- St Dionysius the Areopagite, On The Celestial Hierarchy