No one knows exactly where thought comes from, but it can be said that thought comes from the same place as whatever it is that beats our heart... it comes from being alive.
Confidence, knowing for certain that the person making the call has your safety foremost in their mind. And knowing that the job you are about to take on is the right thing to do, that it makes sense.
Tonight I'll dust myself off, tonight I'll suck my gut in, I'll face the night and I'll pretend I got something to believe in.