I can't stomach motivational stuff nowadays. I could bother to listen a few years ago, but now to me it just seems like a mockery to the suffering of many.
All the self-help books and self-improvement motivation in existence cannot compensate for the world we are born and forced to live in - they will tell you that it's alright, that the wound of being alive will close some day, but at most it just stops hurting for a little while, only for it to open up again.
Talking of quotes, relating to this current topic, I've always drawn a bit of comfort for this one:
"As a philosophy, pessimism needs no defense. If anything needs a defense, it is life itself. And there is no shortage of defenders; it is enough to take a walk around any bookstore to see that there are entire sections dedicated to positivism and self-help. Thousands of books and millions of words that seek to convince us that happiness is possible, that success and well-being are in our hands. That we have power. That we can achieve what we want. That we can succeed and we can win at life, because life is good and worth living. Look closely at what they tell us: life can be won. It seems to me that, without realizing it, these optimists do nothing more than confirm what every pessimist already knows: that life requires effort and that it is a constant struggle and sacrifice; that it is a contest, a confrontation, something that must be won. On this point, Schopenhauer's sentence is overwhelming: if life was designed for our happiness, then it was poorly designed, because everything in life seems to shout loudly: death, pain, illness, sacrifice and endless struggle."
-Ignacio Moya Arriagada, Between Infinites (2021), introduction, p. 14