It is no small comfort to know that grace has not been taken away but is truly constant and unchangeable. Nevertheless, our feeling and awareness of grace are removed for a while, and fear and trembling set in, dejecting and disturbing the soul. The effect is that a man turns impatient and imagines that the wrath of God is unbearable and so turns God into a devil.
Source: Quoted in Ewald M. Plass, What Luther Says, A Practical In-home Theology for the Active Christian. St. Louis: Concordia Publishing House. 1959 Edition, 10th Printing (1994), p. 512.