I don't pray, but in high stress situations I have been praised for my sense of calm. Mainly because in my mind I take a moment to go through The Litany should I feel the need.
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
It actually works really well.
I don't find myself reciting it on a regular basis or anything, but I actually have it written on a little piece of paper in my wallet.