Genesis

"I will"
I said
and you laughed

I reminded you
when you lied
(and stole, and cheated)

I repeated it
when we fought
and you walked away

My words
are yours
to have and hold

not because you're beautiful
but because they're mine

I will not leave you until I have done what I have promised you.
~Genesis 28:15b

That promise, that hope, that faithfulness that God promised to Jacob when nothing seemed to be working out or making much sense...that is the theme of Genesis. Beginning in the Garden God has been working all things toward completion, and He will not stop until He has kept every last one of His promises.

God promised Abraham and Sarah, and they laughed.
Jacob stole his way into the promise, lied to his father, and cheated his brother. Jacob wrestled with God himself then demanded a blessing.

But no matter what happens (or happened) to merit His rejection, His promise is trustworthy because of who He is and because He is the one who made it.