“They have lost the metaphysical sense
Of the future, they feel themselves
The end of a chain
Of lives, single lives
And we know that lives
Are single
And cannot defend
The metaphysic
On which rest
The boundaries
Of our distances.”

1960s, The Quest for Peace and Justice (1964)
Context: Every man lives in two realms, the internal and the external. The internal is that realm of spiritual ends expressed in art, literature, morals, and religion. The external is that complex of devices, techniques, mechanisms, and instrumentalities by means of which we live. Our problem today is that we have allowed the internal to become lost in the external. We have allowed the means by which we live to outdistance the ends for which we live. So much of modern life can be summarized in that arresting dictum of the poet Thoreau: "Improved means to an unimproved end". This is the serious predicament, the deep and haunting problem confronting modern man. If we are to survive today, our moral and spiritual "lag" must be eliminated. Enlarged material powers spell enlarged peril if there is not proportionate growth of the soul. When the "without" of man's nature subjugates the "within", dark storm clouds begin to form in the world.

Esthétique du Mal (1944)
Context: One might have thought of sight, but who could think
Of what it sees, for all the ill it sees?
Speech found the ear, for all the evil sound,
But the dark italics it could not propound.
And out of what sees and hears and out
Of what one feels, who could have thought to make
So many selves, so many sensuous worlds,
As if the air, the mid-day air, was swarming
With the metaphysical changes that occur,
Merely in living as and where we live.

Source: Man: His first Million Years, (1957); this quote begins the penultimate chapter of Trout Fishing in America by Richard Brautigan

Breaking Strain, p. 181
2000s and posthumous publications, The Collected Stories of Arthur C. Clarke (2001)

Source: Your Best Life Now: 7 Steps to Living at Your Full Potential

1960s, Operating Manual for Spaceship Earth (1963)

Essays in Idleness (1967 Columbia University Press, Trns: Donald Keene)
Context: If man were never to fade away like the dews of Adashino never to vanish like the smoke over Toribeyama, but lingered on forever in the world, how things would lose their power to move us! The most precious thing in life is its uncertainty. Consider living creatures- none lives so long a man. The May fly waits not for the evening, the summer cicada knows neither spring nor autumn. What a wonderfully unhurried feeling it is to live even even a single year in perfect serenity.