Oh, Castiel. I must admit that after I forged you and your brothers and sisters, you quickly became my favorite. So inquisitive, so eager to please and explore. You made-you make-so many mistakes...but you are so earnest and you try so hard. You were still so small when I had to leave...but as I am, I still remember your big eyes looking up at me in question, wanting so much to play, to know, to love. None of my other Angels understood the things I tried to teach them, but you took to them so easily. So enamored was I with you, that really, truly, I made humanity in your image, not my own.
Despite what humanity now thinks of me, I am not quite omniscient. In retrospect, if only I have given more thought, more time to the creation of humanity. Talked to Lucifer beforehand, or after, to address his jealousy. But I did not. And you, my son, bore the brunt of that error due to the very nature your being that I loved. And for that, I am sorry.
But Castiel, my child. Do not be discouraged. I have not gone from this world. I can still hear your prayers. While it may be true that I am a capricious, vengeful God, you are still one of my favorites. I know you are suffering for my mistakes, and there is little I can do about that. My offspring have spiraled out of control without drastic measures that I am not willing to take. So I have left you. To live the lives you have all chosen for yourselves. To see how it all plays out. But still, I love you. I love you all, but especially you-of the clever mind, kind spirit, and capacity for growth unlike that of any of your brothers and sisters.
You are the best of all my Angels. You may not be the strongest or the smartest, but you have the best of all that I wanted for my Angels. You have the most heart. The most grit.
And your Father loves you.
I have made you a soul. And he shall be the most Righteous; the only acceptable gift for God's favorite Angel, the Heart. The two of you together, my favored children, will shine so bright! The world will tremble with your thunder. Find each other. Soar as you are meant to, for you and all who you will touch together are my hope. My hope for humanity. My hope for your brothers and sisters.
I have faith in you, my child. Castiel. You are my shield. You will defend the hopes I had for my Children.
You were the answer to my prayers.