How we cite our quotes: All quotations are from Star Trek IV: The Voyage Home.
Quote #4
SPOCK: Admiral, may I ask you a question?
KIRK: Spock, don't call me "admiral." You used to call me Jim. Don't you remember?
As a result of his brain reset, Spock takes a step back from his former friends, defaulting instead to a strict professionalism. Kirk, of course, can't stand the formality. It's not his style.
Quote #5
SPOCK: Admiral, may I suggest that Doctor McCoy is correct. We must help Chekov.
KIRK: Is that the logical thing to do, Spock?
SPOCK: No, but it is the human thing to do.
Eventually, Spock gets the picture. Maybe it's because he can see the others' loyalty to and affection for him. Maybe it's just that his brain is finally booted up. Either way, this represents a renewal of his bond with his comrades. It's so sweet we want to cry.
Quote #6
SPOCK: I don't think he understands.
MCCOY: No, Spock. He means that he feels safer about your guesses than most other people's facts.
Here, Spock realizes how important trust is to friendship. Kirk would trust Spock with his life—and has trusted him with it many times in the past. That kind of trust creates a bond between two men that spans galaxies, dimensions, and even the barrier between life and death. It's truly a bromance for the ages.