There's something very heartfelt and yet also tragic in the moment when Nurse Chapel arrives in Spock's quarters to tell him that they will arrive at Vulcan soon. Before she can tell him that, Spock speaks of the dream he had of her, and then when he says "It would be illogical for us to protest against our natures..." If only Nurse Chapel didn't tell him, he would've chosen her right then and there to mate with him, to satisfy the pon farr that was affecting him. It's touching in how we understand that, perhaps, deep down, Spock always had a certain affection for Nurse Chapel, and appreciated her feelings of attraction for him in an intimate sense. It was not logical, but it was sincere and honest.