Dr. Peter Duval: The medieval philosophers were right. Man is the center of the universe. We stand in the middle of infinity between outer and inner space, and there's no limit to either.

Cora Peterson: We're going to see things no one has ever seen before. Just think about it.
Grant: That's the trouble. I am.

Grant: [as the team enters a door marked "Sterilization Room"] How much can a man give to his country?

Grant: Wait a minute! They can't shrink me.
General Carter: Our miniaturizer can shrink anything.
Grant: But I don't want to be miniaturized!
General Carter: It's just for an hour.
Grant: Not even for a minute!

Col. Donald Reid: [General Carter goes to squash an ant that is crawling around among spilt sugar granules, then hesitates and finally relents as he reflects on how the crew in Benes' body are smaller than the ant] You'll wind up a Hindu; and love all forms of life, no matter how small.

General Carter: [after the briefing before the mission] Any questions?
Grant: Yes. When can I catch the next train back to town?

[as the submarine enters the brain]
Dr. Duval: Yet all the suns that light the corridors of the universe shine dim before the blazing of a single thought...
Grant: - proclaiming in incandescent glory the myriad mind of Man...
Dr. Michaels: Very poetic, gentlemen. Let me know when we pass the soul.
Dr. Duval: The soul? The finite mind cannot comprehend infinity - and the soul, which comes from God, is infinite.
Dr. Michaels: Yes, well, our time isn't.