Who only hath immortality (ho monos echōn athanasian). “The one who alone has immortality.” Athanasia (athanatos, a privative and thanatos), old word, in N.T. only here and 1Co 15:53. Domitian demanded that he be addressed as “Dominus et Deus noster.” Emperor worship may be behind the use of monos (alone) here.
Unapproachable (aprositon). See Psa 104:2. Late compound verbal adjective (a privative, pros, ienai, to go). Here only in N.T. Literary Koiné[28928]š word.
Nor can see (oude idein dunatai). See aoraton in Col 1:15 and also Joh 1:18; Mat 11:27. The “amen” marks the close of the doxology as in 1Ti 1:17.