[Spock]: “This troubled planet is a place of the most violent contrasts. Those who receive the rewards are totally separated from those who shoulder the burdens. It is not a wise leadership.”

[Dr. McCoy]:  “I don’t like it, Jim. A vessel this size cannot be run by one computer.”
[Spock]: “We’re attempting to prove that it can run this ship more efficiently than man.”
[Dr. McCoy]:  “Maybe you’re trying to prove that, Spock but don’t count me in on it.”
[Spock]: “The most unfortunate lack in current computer programming is that there is nothing available to immediately replace the starship surgeon.”

[Spock]:  “On my planet, “to rest” is to rest, to cease using energy. To me it is quite illogical to run up and down on green grass using energy instead of saving it.”

[Spock]: “I am a Vulcan, doctor. Pain is a thing of the mind. The mind can be controlled.”
[Captain Kirk]:  “You’re only half Vulcan. What about the human half?”
[Spock]: “It is proving to be an inconvenience, but it is managable.”

[Spock]: “Frankly, I was rather dismayed by your use of the term “half-breed”, captain. You must admit it is an unsophisticated expression. “
[Captain Kirk]:  “I’ll remember that, Mr Spock, the next time I find myself in a similar situation.”

[Spock]:  “Instrument readings indicate life form but of a highly unusual and intermittent nature. They have no discernible form or location. A most puzzling phenomenon, Captain.”