Who only hath immortality - The word here - ἀθανασία athanasia - properly means “exemption from death,” and seems to mean that God, in his own nature, enjoys a perfect and certain exemption from death. Creatures have immortality only as they derive it from him, and of course are dependent on him for it. He has it by his very nature, and it is in his case underived, and he cannot be deprived of it. It is one of the essential attributes of his being, that he will always exist, and that death cannot reach him; compare the expression in John 5:26, “The Father hath life in himself,” and the notes on that passage.
Dwelling in the light which no man can approach unto - Greek, “Inhabiting inapproachable light.” The light where he dwells is so brilliant and dazzling that mortal eyes could not endure it. This is a very common representation of the dwelling place of God. See examples quoted in Pricaeus, in loc. Heaven is constantly represented as a place of the most pure and brilliant light, needing not the light of the sun, or the moon, or the stars Revelation 21:23-24; Revelation 22:5, and God is represented as dwelling in that light, surrounded by amazing and inapproachable glory compare Revelation 4:6; Ezekiel 1:4; Hebrews 1:3.
Whom no man hath seen nor can see - notes on John 1:18.
To whom be honour and power everlasting. Amen - see the notes on Romans 11:36.