This quote from Frank Herbert's Dune is a litany against fear from the Bene Gesserit. I find the litany quite a good way to deal with the unexpected things in life. People so easily succumb to fear, whereas the human mind can conquer a lot of issues encountered in life and the universe.

"I must not fear. Fear is the mind-killer. Fear is the little death that
brings total obliteration. I will face my fear. I will permit it to pass over
me and through me. And when it has gone past, I will turn the inner eye to see
it's path. Where the fear has gone there will be nothing. Only I will remain."