I mention several book quotes every now and then, but find myself using a ridiculous amount of times “There is nothing like looking, if you want to find something”, from The Hobbit.
Tolkien really nailed it with that one, it is applicable to so many situations. I even say it to myself often.
Do you have any quotes that you say all the time?
I’ve found myself reciting the litany against fear from Dune in situations where I become anxious.