On the Finished Pile:

Faith Beyond Feelings by Jonathan Edwards.

Here is a quote that sums up the book:

"The more a true saint loves God with a gracious love,
the more he desires to love Him. His uneasiness
concerning his lack of love for God will increase. The
more he hates sin, the more he will want to hate it.
He will regret that he still has so much remaining love
for it. The more his heart is broken, the more he will
want it to be broken further. The more he thirsts and
longs after God and His holiness, the more he will long
and breathe out his very soul in more longings after
God. Like a kindled flame that rises higher, the more
ardently it burns, the more it will continue to burn."