A familiar image of the cross from the early church. Luther used it as well.
God therefore hid himself under the veil of our nature so that the devil, throwing himself like a ravenous fish on the bait of mankind might be caught on the hook of deity ... He thought he would hold it in death like a man but Christ acted according to his nature. As the light, he dispelled darkness. As the life, he destroyed death.
Gregory of Nyssa