"Do you know why I kept your last name and gave you the word 'Shou'?"
"Mu Shou, Mu Shou, I keep your last name to remind you all the time that you need to know your identity clearly. I gave you the word 'Shou' to let you know that as a person in the Jiang family, you must keep your duty."
Oh, if you want him to guard his "duty" well, fine, then he will guard Jiang Liu well. He will guard Jiang Liu "well" throughout his life.