There's thee that I always loved, and know many can relate too.
Funny thing is that they all hail from Attack on Titan.
"This world is merciless, yet it's also very beautiful." - Mikasa Ackerman
Mikasa is right, minus the fact we aren't fighting Titans and living in fear of being swallowed whole we still live everyday in fear. People have no shame killing off innocents just because they can or they don't like something about them. Without showing a shred of piety or thinking that that person is a human and has loved ones. But aside from all the horrible and cruel things in life, this planet is amazing. To think that something like our home planet can sustain life while others like it can't. To see so many different animals and humans, and places is amazing.
The next one is
"People, who can’t throw something important away, can never hope to change anything."- Armin Arlet
I know personally I have had many things in my life that I refused to give up. Be it a toy or even something like measly as a doughnut. But giving up that one thing to another not only makes us feel better, like we accomplished something but we helped another person. Like donating clothes or food. Sure we can deal and give fifty reasons as to why we need it but by giving it up we make changes that we may not feel right now but will a huge impact in the future.
And my all time favorite is
"I don't know which option you should choose. I could never advise you on that... No matter what kind of wisdom dictates you the option you pick, no one will be able to tell if it's right or wrong until you arrive to some sort of outcome from your choice."- Levi Ackerman (no known relation to Mikasa...yet)
I love this one because Levi is right no one can tell if making a choice will end well or horribly (you've met with a terrible fate haven't you?). Maybe not cleaning the kitchen will result in our parents changing their plan on taking us out to eat, maybe not watching the news on a certain day we will miss the announcement of the Zombie Apocalypse.
I don't know it can be anything, it's best to always weigh the pros and cons and do the right thing.