A word of wonder: numinous, meaning awe-inspiring and mysterious, like an overwhelming spiritual feeling of terror and fascination. Wikipedia cites various authors attempting in various ways to describe the indescribable. Best not to try?!

Or perhaps via poetry: Jane Hirshfeld in "Spiritual Poetry: 22 poems about spirituality and enlightenment" (2006) collects some verse and comments. Among them Emily Dickinson:

The Props assist the House
Until the House is built
And then the Props withdraw
And adequate, erect,
The House support itself
And cease to recollect
The Auger and the Carpenter –
Just such a retrospect
Hath the perfected Life –
A past of Plank and Nail
And slowness – then the Scaffolds drop
Affirming it a Soul –

... which by chance (?!) Eliot A. Cohen recommends in The Atlantic (Go Memorize a Poem: In times of crisis, learning and reciting poetry can act as a balm) only a few days ago.

... and in the middle of Hirshfeld's commentary, an aside quoting Paul Valéry:

There is another world,
and it is in this one.

(or maybe that numinous quote is by William Butler Yeats or Paul Éluard? – cf Silence not Ignorance (2005-06-05), Atheist Spirituality (2009-01-29), Valorization of Mind over matter (2010-05-16), Enso (2012-02-29), Aspiration, not Expectation (2014-12-12), Attention (2015-03-03), Holding Space (2016-07-22), Subtle Sound (2017-01-03), New Superpower (2018-10-27), You Must Change Your Life (2019-02-01), Sharing Awareness (2020-07-06), ...) - ^z - 2020-08-09