I read "Dune" back in the early 1970s and have always remembered the Bene Gesserit litany against fear.
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 its path.
Where the fear has gone there will be nothing.
Only I will remain.
Herbert, Frank (1965). Dune.