Related:

• To restrict a segment of the population to such hardship is unthinkable in an evolved culture.
  -- Spock, "The Cloud Minders," stardate 5818.4...
• Violence in reality is quite different from theory.
  -- Spock, "The Cloud Minders," stardate 5818.4....
• All the little things you and I understand and expect from life, such a
  equality; kindness; justice ... -- Spock, "The Cloud Minders," stardate 5818.4....
• Hours can be centuries -- Vanna the Troglyte, "The Cloud Minders," stardate 5819.0.
• Light and warmth! That's necessary to all humanoids.
  -- Kirk, "The Cloud Minders," stardate 5818.4....
• This troubled planet [Ardana] is a place of most violent contrasts -- those who receive the rewards are totally separated from those who shoulder the burdens.
  It is not a wise leadership. -- Spock, "The Cloud Minders," stardate 5818.4....
• Beauty is transitory. Beauty survives. -- Spock and Kirk, "That Which Survives," stardate unknow
• There are always alternatives. -- Spock, "The Galileo Seven," stardate 2822.3.
• It's hard to believe that something which is neither seen nor felt can do so much harm.
  That's true. But an idea can't be seen or felt. And that's what kept the Troglytes in the mines all these centuries....