A MAN: "It makes me long for the good old days when there
was honest warfare and simple devotion to honour and the
flag. Space Guns indeed! What is the world coming to?"

THE WOMAN: "I wish I'd lived in the good old days before
all this horrible science took possession of us."
...

CABAL: "Fully. Yet all this is incredible to me.
Insurrection! Against exploration! Mankind turning upon
science and adventure. Wanting to call a halt. It's a mood,
Mitani."

MITANI: "It is a dangerous mood."

CABAL: "It's a fit of nerves--at the thought of stepping
off this planet and leaping into space. Well--first we must
save the gun.

MITANI: "That first."
...
THEOTOCOPULOS: "We want to save these young people from
your experiments. We want to put an end to this inhuman
foolery. We want to make the world safe for men. We mean to
destroy that gun."

CABAL: "And how will you do that?"

THEOTOCOPULOS: "Oh! we have electricians with us too."

CABAL: "We have a right to do what we like with our own
lives--with our sort of lives."

THEOTOCOPULOS: "How can we do that when your science and
inventions are perpetually changing life for us--when you are
everlastingly rebuilding and contriving strange things about
us? When you make what we think great, seem small. When you
make what we think strong, seem feeble. We don't want you in
the same world with us. We don't want this expedition. We
don't want mankind to go out to the moon and the planets. We
shall hate you more if you succeed than if you fail. Is there
never to be rest in this world?"

...
CABAL is seen standing alone. He is moved by his own
thoughts and feelings to speech. He comes to the railing:
"Listen, Theotocopulos! If I wished to give way to you, I
could not. It is not we who war against the order of things,
but you. Either life goes forward or it goes back. That is
the law of life."

THEOTOCOPULOS dismisses the argument by a gesture: "We
will destroy the gun."
...
An observatory at a high point above Everytown. A telescopic
mirror of the night sky showing the cylinder as a very small
speck against a starry background. Cabal and Passworthy stand
before this mirror.

CABAL: "There! There they go! That faint gleam of light."

Pause.

PASSWORTHY: "I feel--what we have done is--monstrous."

CABAL: "What they have done is magnificent."

PASSWORTHY: "Will they return?"

CABAL: "Yes. And go again. And again--until the landing
can be made and the moon is conquered. This is only a
beginning."

PASSWORTHY: "And if they don't return--my son, and your
daughter? What of that, Cabal?"

CABAL (with a catch in his voice but resolute): "Then
presently--others will go."

PASSWORTHY: "My God! Is there never to be an age of
happiness? Is there never to be rest?"

CABAL: "Rest enough for the individual man. Too much of it
and too soon, and we call it death. But for MAN no rest and
no ending. He must go on--conquest beyond conquest. This
little planet and its winds and ways, and all the laws of
mind and matter that restrain him. Then the planets about
him, and at last out across immensity to the stars. And when
he has conquered all the deeps of space and all the mysteries
of time--still he will be beginning."

PASSWORTHY: "But we are such little creatures. Poor
humanity. So fragile--so weak."

CABAL: "Little animals, eh?"

PASSWORTHY: "Little animals."

CABAL: "If we are no more than animals--we must snatch at
our little scraps of happiness and live and suffer and pass,
mattering no more--than all the other animals do--or have
done." (He points out at the stars.) "It is that--or this?
All the universe--or nothingness.... Which shall it be,
Passworthy?"

The two men fade out against the starry background until
only the stars remain.
The musical finale becomes dominant.

CABAL'S voice is heard repeating through the music: "Which
shall it be, Passworthy? Which shall it be?"

A louder stronger voice reverberates through the
auditorium: "WHICH SHALL IT BE?"

The whole script here:

http://www.geocities.com/scifiscripts3/scripts/thingstocome.txt

One change I noted: The script has the future Everytown being in the year 2054-2055. In the 1936 film, it was 2036.