Trust God's Word,
Not a Condemning Conscience
He who would enter the kingdom of Christ must pass beyond all feeling and be carried into a region where sensation is nothing. For we are not to judge by feeling.
Therefore if conscience accuses you of sin, if it sets the wrath of God before your eyes, if it tears Christ, the Redeemer, from you, you must not assent but must judge against your conscience and feelings that God is not angry and that you are not damned. For Scripture says that the kingdom of Christ lies beyond the domain of feeling. Therefore we must judge against our feeling.
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.