Obey:

Castiel was always the most obedient of angels.

Even by angelic standards, Castiel was always quick to follow an order, to jump to attention, to charge into an attack.

That last one has caused him to kill women and children with no defense

Castiel did not resent his obedience. He is an angel, it was right. He was doing as all the other angels. Disobedience is the highest sin.

It was when Anael fell of her own choosing that Castiel began to question his absolute obedience. Were not the others like him?

When Castiel was charged to go to hell to retrieve the Righteous Man, it was the first time he wanted to say no. it was an honor and a privilege, but his fear overwhelmed him. And so he said no.

What came out was 'yes'.

hello! sorry the formating's weird on this one, I wanted the center alined ones to simply be indented for effect, but apparently FF won't let me do that. oh well, hopefully you still kind of get what I was going for. (not that I'm entirely sure what that was)

This one was from my Philosophy notebook!