Leonard McCoy: Dear Lord. You think we're intelligent enough to... suppose... what if this thing were used where life already exists?
Spock: It would destroy such life in favor of it's new matrix.
Leonard McCoy: Its "new matrix"? Do you have any idea what you're saying?
Spock: I was not attempting to evaluate its moral implications, Doctor. As a matter of cosmic history, it has always been easier to destroy than to create.
Leonard McCoy: Not anymore; now we can do both at the same time! According to myth, the Earth was created in six days. Now, watch out! Here comes Genesis! We'll do it for you in six minutes!
Spock: I do not dispute that in the wrong hands...
Leonard McCoy: "In the wrong hands"? Would you mind telling me whose are the right hands, my "logical" friends? Are you, by any chance, in favor of these experiements?
James T. Kirk: Gentlemen, this isn't -
Spock: Really, Dr. McCoy. You must learn to govern your passions; they will be your undoing. Logic suggests...
Leonard McCoy: "Logic"? My God, the man's talking about logic; we're talking about universal Armageddon! You green-blooded, inhuman...
Computer: Bridge to Admiral Kirk.
McCoy and Spock have a heated debate about the Genesis' ability to create and destroy life, which is interrupted by the computer.