Re: Prime Spock's last line?
It was Spock's way of acknowledging the start of the young crew's mission together/reliving the start of his
mission with his
Kirk and crew. It was hope and nostalgia mixed together. Spock wanted to ensure that his younger counterpart and young Kirk and the crew he knew would be on the job in this timeline as well... that's why he worked young Spock first, then went to witness Kirk's ascension to Captain.
"Thrusters on full..." was his way of acknowledgint that he'd gotten everyone together and that it was their turn now... their mission was underway.
For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear. - 2 Timothy 4:3