When I mentioned the Bene Gesserit Litany Against Fear (from Dune (1965) by Frank Herbert) to someone ...
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.
... sie gave me hir personal version that sie finds effective:
This is very unlikely to kill me and later there will be ice cream.
(intentionally anonymous)