Uhura: "At that volcano, you didn't give a thought to us. What it would do to me if you died, Spock. You didn't feel anything. You didn't care. And I'm not the only one who's upset with you. The Captain is, too."
Kirk: "No, no, no. Don't drag me into this. She is right."
Spock: "Your suggestion that I do not care about dying is incorrect. A sentient being's optimal chance at maximizing their utility is a long and prosperous life."
Uhura: "Great."
Kirk: "Not exactly a love song, Spock."
Spock: "You misunderstand. It is true I chose not to feel anything upon realizing my own life was ending. As Admiral Pike was dying, I joined with his consciousness and experienced what he felt at the moment of his passing. Anger. Confusion. Loneliness. Fear. I had experiences those feelings before, multiplied exponentially on the day my planet was destroyed. Such a feeling is something I choose never to experience again. Nyota, you mistake my choice not to feel as a reflection of my not caring. Well, I assure you, the truth is precisely the opposite."