I just thought that this was really cool when I stumbled across it.

Courage is resistance to fear, mastery of fear – not absence of fear.

Mark Twain

US humorist, novelist, short story author, & wit (1835 – 1910)
source

It is very similar to one of my other favorite quotes from the movie Dune:

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.