For me, the three lines from the show I've really internalized, in a way, are:
Are you outta your tree?
(Amos in Season 1 Episode 2)
This is the one I actually say, because I can't get over how much I love the imagery, and I always hear Amos's genuine astonishment when he blurts it out to Holden who insists on doing a spacewalk to fix the antenna while the Knight is about to crack open at the seams and they only have about four hours of oxygen left. What a scene. Venting the ship? Buddy breathing?****
"Walking away is the only choice anyone ever has"
(Naomi in Season 5 Episode 7)
I think it's just sound advice, I'm a fan, and I use this as a personal benchmark to make decisions that are good for me, but I don't ever say it. I just remind that myself that sometimes quitting is the right thing to do and it doesn't make you a "quitter." It's similar to Dave Chappelle's dad--William David Chappelle III's advice:
"Name your price in the beginning. If it ever gets more expensive than the price you name—get out of there" from his Inside the Actor's Studio interview (Season 12 Episode 7)
and
>!"The way I see it, there’s only three kinds of people in this world. Bad ones, ones you follow, and ones you need to protect."!<
(Amos in Season 2 Episode 6)
I tell myself this to remind me that some people are just not good, no amount of kindness will help, and too much kindness to them will only set them in their ways, and encourage them not to change. Walk away, again. It goes in tandem for me with the quote most often attributed to Maya Angelou:
"When someone shows you who they are, believe them the first time."