Gadreel and Castiel in “Unfinished Business”

Gadreel

I sat in this hole for thousands of years, thinking of nothing but redemption, of reclaiming my good name. I thought of nobody, no cause, other than my own.

Castiel

You've been redeemed, my friend.

Gadreel

The only thing that matters in the end is the mission... protecting those who would not and cannot protect themselves...