John Gill, on 1Tim 6:16

Who only hath immortality,.... Angels are immortal, and so are the souls of men, and so will be the bodies of men after the resurrection; but then neither of these have immortality of themselves, they have it from God; who only has it, of himself, originally, essentially, and inderivatively. Dwelling in that light which no man can approach unto; in this present, frail, and mortal state; yea, angels themselves cannot bear the lustre of it, but cover their faces with their wings; for God is light itself, as well as clothes himself with light, as with a garment; and is the Father and fountain of lights to all his creatures. Whom no man hath seen, nor can see: nowhere but in Christ, at least spiritually and savingly; and that but very imperfectly in the present state: the sin, frailty, and mortality of human nature must be taken away, in order to inherit the kingdom of God, and enjoy the beatific vision of him; which saints in heaven have, who see him as he is, and in such sort as no man now does, or can see him: to whom be honour and power everlasting, Amen. Which may be considered either as a wish, that such honour, power, and glory might be ascribed unto him, as we supply it; or as an assertion that it is given to him, as it is by the angels, and by the saints in heaven and in earth.