Depends on the thing. In a life or death situation it’s adrenaline, impulse, and self preservation.
In matters of money, I have very little courage. What looks like courage on the outside is actually acceptance that if I lose the money I won’t die. In other words, I’m not courageous, but rather in a place of acceptance. It actually doesn’t feel good at all. Feels more like being run over. I never feel good about it until I actually come out ok on the other side. Meaning, if it’s an investment or gamble, I don’t feel good until I actually realize the profit in my pocket book. If it’s a house, even while enjoying my house I worry about the price going up or down. It’s horrible.
In matters of love I never needed courage, thank goodness. Not yet anyway.
I guess for me is it’s simply that I do whatever it is, even though I’m frightened.