What’s a phrase or quote that helps you keep going?

The horrors persist, but so do I.

Also, Al Swearingen had a relevant line in Deadwood

Pain or damage don’t end the world. Or despair, or fucking beatings. The world ends when you’re dead. Until then, you got more punishment in store. Stand it like a man, and give some back.

Clearly this isn’t the healthiest way of coping with things, but sometimes I’m not in the right frame of mind to process stuff optimally, and so I think of lines like this one.

Don’t let the bastards grind you down.

I'm guilty of not following it as often as I should, but when I was much younger I'd try to tell myself "if you go through life saying: what if? You'll only end life saying: if only."

This, too, shall pass.

My brother told me about it, said that there's an old legend about a king who had it (but in Latin/Greek/whichever language) engraved onto a ring. During parties, he looked at it so he wouldn't get carried away, during hard tomes he looked at it to stay strong in hope of a better future.

It's a song lyric for me, Perfectly Flawed by Otep includes the line "Don't you do it, you're not even you yet." I first heard it pretty early on in transition and deep in depression, and it resonated really strongly with me. I'm doing better now than I was then, but that line still sticks with me.

More of a realization than a quote: Death offers nothing that life cannot offer.

I am an existentialist, and I do not think anything (that is not terminal, I guess; haven't though about extreme conditions) is worse than death. So, every bad thing will pass. Every depressive bout and anxiety attack shall pass. Hopefully, your rock bottom shall pass too. And may be, at the other side, things will be better for you.

This is all I could come up with.

"Forgive yourself for not knowing what you didn’t know before you learned it" - Maya Angelou

Edit: "Live for yourself, there's no one else more worth living for" - Anthem by Rush

"Only in death does duty end" or "Hope is the first step on a road to disappointment"

Honestly there are quite a few quotes or toughts of the day in Warhammer 40k universe that are kinda useful and helpful.

Embrace the impermanence.

One foot in front of the other, don’t think about how far you have to go, only think about the next step.

"You will be warm again", from Stormlight Archive

Lately it's been "we're here, again". It's in relation to some bad news about the health of a family member. It's a recognition that this happened before, and it's happening again.

But there's hope in that reconition, because when this happened before they got through it. We will get through it again.

“Motivation is not required”

Less a phrase and more just taking a deep breath, holding it for a good while, letting it out. Or stare into space with my hands on my head, then giving a huff and getting back to it.

More inline with your question though, I knew a good man once that was fond of sayings and turns of phrase, he used to say, "It'll be OK in the end. If it's not OK, it's not the end."

Man up and stop being a bitch