Another Reformer, often unknown, was Heinrich Bullinger. Below are a few quotes – feel free to add your own.
“This depravation of our nature is nothing else but the blotting out of God’s image in us.”
“There was in our father Adam before his fall the very image and likeness of God.”
The ineffable mercy and divine grace of the eternal God are proven, first, in that God offers this covenant not in any way because of the merits of humans but rather out of the sheer goodness which is God’s nature. I do not know whether humans are capable of conceiving this mystery fully or conveying how praiseworthy it is (BE 104-105).