“On earth there are frontiers, in the sky there are none.”

A couplet he wrote in Kannada, before writing his first full poem in the language.
Poet, nature lover and humanist (2004)

Source: A Tale for the Time Being

Book VII, Ch. 4
Death Comes for the Archbishop (1927)
Context: The sky was as full of motion and change as the desert beneath it was monotonous and still, — and there was so much sky, more than at sea, more than anywhere else in the world. The plain was there, under one's feet, but what one saw when one looked about was that brilliant blue world of stinging air and moving cloud. Even the mountains were mere ant-hills under it. Elsewhere the sky is the roof of the world; but here the earth was the floor of the sky. The landscape one longed for when one was away, the thing all about one, the world one actually lived in, was the sky, the sky!

As quoted in "Science Attests the Accuracy of the Bible" in The Watchtower (1 October 1980)

Unpublished Sonnet (originally written as a preface to Becket), in Alfred Lord Tennyson: A Memoir by His Son, by Hallam T. Tennyson (1897)

Variant: And I love you," Kieran said. "You are all that exists on the earth and under the sky that I do love.
Source: Lady Midnight

Starting from Paumanok. 7
Bartlett's Familiar Quotations, 10th ed. (1919)

"Where I End and You Begin"
Lyrics, Hail to the Thief (2003)

Source: Cosmos (1980), p. 318
Context: The choice is with us still, but the civilization now in jeopardy is all humanity. As the ancient myth makers knew, we are children equally of the earth and the sky. In our tenure on this planet we've accumulated dangerous evolutionary baggage — propensities for aggression and ritual, submission to leaders, hostility to outsiders — all of which puts our survival in some doubt. But we've also acquired compassion for others, love for our children and desire to learn from history and experience, and a great soaring passionate intelligence — the clear tools for our continued survival and prosperity. Which aspects of our nature will prevail is uncertain, particularly when our visions and prospects are bound to one small part of the small planet Earth. But up there in the immensity of the Cosmos, an inescapable perspective awaits us. There are not yet any obvious signs of extraterrestrial intelligence and this makes us wonder whether civilizations like ours always rush implacably, headlong, toward self-destruction. National boundaries are not evident when we view the Earth from space. Fanatical ethnic or religious or national chauvinisms are a little difficult to maintain when we see our planet as a fragile blue crescent fading to become an inconspicuous point of light against the bastion and citadel of the stars. Travel is broadening.