“Immortal is an ample word
When what we need is by,
But when it leaves us for a time,
’T is a necessity.

Of heaven above the firmest proof
We fundamental know,
Except for its marauding hand,
It had been heaven below.”

Song 28: "For the Lord's Day Evening".
1710s, Divine Songs Attempted in the Easy Language of Children (1715)

Variant translation: There is but one temple in the Universe and that is the Body of Man.
As inscribed on the Library of Congress, quoted in Handbook of the New Library of Congress (1897) by Herbert Small, p. 53
Novalis (1829)
Context: There is but one Temple in the World; and that is the Body of Man. Nothing is holier than this high form. Bending before men is a reverence done to this Revelation in the Flesh. We touch Heaven, when we lay our hand on a human body.

"Little Things" (1845) as quoted in Our Woman Workers: Biographical Sketches of Women Eminent in the Universalist Church for Literary, Philanthropic and Christian Work (1881) by E. R. Hanson. These were the final words of the poem in the original publication, but later versions published anonymously by other authors appended various additions to this. It has also often appeared credited to Carney in a variant form:
Little deeds of kindness,
Little words of love,
Help to make earth happy
Like the heaven above.

Song for St. Cecilia's Day (1692), st. 3.

1544: Who has not found the Heaven — below —
The Complete Poems of Emily Dickinson (1960)
Source: The Collected Poems of Emily Dickinson

Canto III, stanza 2.
The Lay of the Last Minstrel (1805)
Context: In peace, Love tunes the shepherd's reed;
In war, he mounts the warrior's steed;
In halls, in gay attire is seen;
In hamlets, dances on the green.
Love rules the court, the camp, the grove,
And men below, and saints above;
For love is heaven, and heaven is love.

Manmadin, The Indian Cupid. Floating down the Ganges from The London Literary Gazette (14th December 1822) Fragments in Rhyme VII
The Improvisatrice (1824)