A few of my favorite snippets by Spock:
"Frankly I was rather dismayed by your use of the term 'half-breed'." - TOS, Dr. Corby.
(Examining filmstrip) - "Poor photography" - TOS, Assignment Earth.
"Doctor, I'm due for another injection of stochaline." - TOS, By Any Other Name.
"My operatives would avenge my death, and some of them are Vulcans." - TOS, Mirror, Mirror.
(To Dr. McCoy) - "He's probably terrified of your beads and rattles." - TOS, I ,Mudd.
"That's exactly why I hate you, because you're identical." - TOS, I, Mudd.
"Logic is a little birdie chirping in a meadow. Logic is a wreath of pretty flowers which smell bad." - TOS, I, Mudd.
"I would advise youse to keep dialing, Oxmyx." - TOS, Piece of the Action.
"I am attempting to build a mnemonic memory circuit using stone knives and bearskins." - TOS, All our Yesterdays.
"Fortunately I am immune to its effect." - TOS, Trouble with Tribbles.
"What does it mean, exact change?" - Star Trek IV.
"How will playing cards help?" - Star Trek IV.
"There's an old Vulcan proverb - only Nixon could go to China." - Star Trek VI.
"Logic is the beginning of wisdom, not the end." - Star Trek VI.