I hoard quotes I like on a Pinterest board, and I choose the quotes partially based on my students, I consider what I think they need to hear.
I actually say this one a lot in class when student s point out my mistakes (typos and such).
For my AP kiddos who are creating something with the information we learn.
I hope to throw all of these in a flight am at the end of the year - I think it will look super cool. I also think this is something I can keep up with. Daily quotes would be asking too much of me, but my students like it enough to pay attention and even ask for new quotes. And the chalk is easy enough that I can write out my quote and I usually decorate it at a later time.
My favorite quote I forgot to take a picture of ... "Promote what you love instead of bashing what you hate."