Spock finally fully accepts and admits to feelings he was terribly ashamed of in The Original Series. What exactly those feelings areis up to interpretation, but it's heartwarming either way. Bear in mind that they've both spent the whole movie explicitly Not Mentioning the fact that Spock abandoned the ship after the end of the series to return to Vulcan, because he has rejected all traces of emotion for pure logic, and appears to have wilfully forgotten every feeling he ever had for his friends. But when he wakes up...
Spock: V'ger has knowledge that spans this universe. And yet, with all its pure logic, V'ger is barren. Cold. No mystery... no beauty... I should've known... [trails off]
Kirk: [leaning over him] Known? Known what? Spock, what should you have known?
Spock: [taking Kirk's hand] Jim, this simple feeling is beyond V'ger's comprehension.
"I want this, Jim! As much as you wanted the Enterprise, I want THIS."
