Sarek’s emotional outbursts are amazing and hard to watch, Stewart’s perfomance as well is amazing. 

Sarek with Picard’s stability and memories is so nice.

“We shall always retain the best part of the other inside us.”

Memory Alpha also has some said anecdote about this episode:

• For (Michael) Piller, there was an even deeper resonance to the story. “What I remember most about that episode, however, is that in a very real way it reflected what was going on with the show at the time we wrote it. Gene [Roddenberry] was beginning to go into decline. Not that he was completely uncommunicative, but it was clear that he was not the same man that he had been. We all respected him so much, and he had been such an important, strong leader of the franchise and everything it stood for. But here is this great man - and I’ve only known him for less than a year at this point - here is this great man going into decline, and I immediately felt a very strong connection to the premise of ‘Sarek,’ because I could see that it really was about the universe that we lived in on a daily basis. If you go back and look at 'Sarek’ closely, what that character is, is Gene Roddenberry.” (Star Trek: The Next Generation - The Continuing Mission)