‘Who only hath immortality.’ Only God possesses imperishability, indestructibility, only Father, Son, and Holy Spirit, the triune God.
It takes your minds back to when you were young and you went into the sea in youth, and you scrambled about and it's a hot summer's day. The waters are warm, but it is roughish, and maybe that is to your taste; you enjoy even tumbling about in the breakers and then swimming out. You are young and it's glorious. But then you stand up in the water and you look out and at the horizon – maybe it's the Atlantic Coast; maybe you're in the USA looking from at the Pacific – and you think to yourself, ‘How far away the horizon is! I'm enjoying this, but I'll never taste that water over there. That's beyond my reach, and beyond the horizon it goes on for another couple of thousand miles. I'll never experience that or taste that, but I know it's there,’ In heaven it's rather like that. You are more than overwhelmed by the glory of God and yet you know it stretches on and on, ever more glorious, beyond anything you will ever explore or know or taste.
‘Whom no man hath seen, nor can see.’ In millions and millions of earthly years these words will still be true – the ocean of truth is so great and so vast. ‘To whom be honour and power everlasting. Amen.’ Imagine seeing and sensing and feeling all the glorious attributes of God and basking in them. There's nothing like the future for a Christian believer; there is nothing on earth to be compared with eternal life. Just think of this eternal bliss and glory: to see my God, to see my Saviour, to feel and know these things. It is beyond all speech and all description.