Jerome Weller was a theology student under Martin Luther's direct influence, living in his home and tutoring his children for nearly a decade. In July 1530, Luther wrote a letter of advice to Weller who was in the midst of a depression.
. . . Excellent Jerome, You ought to rejoice in this temptation of the devil because it is a certain sign that God is propitious and merciful to you. You say that the temptation is heavier than you can bear, and that you fear that it will so break and beat you down as to drive you to despair and blasphemy. I know this wile of the devil. If he cannot break a person with his first attack, he tries by persevering to wear him out and weaken him until the person falls and confesses himself beaten.
Whenever this temptation comes to you, avoid entering upon a disputation with the devil and do not allow yourself to dwell on those deadly thoughts, for to do so is nothing short of yielding to the devil and letting him have his way. Try as hard as you can to despise those thoughts which are induced by the devil. In this sort of temptation and struggle, contempt is the best and easiest method of winning over the devil. Laugh your adversary to scorn and ask who it is with whom you are talking. By all means flee solitude, for the devil watches and lies in wait for you most of all when you are alone. This devil is conquered by mocking and despising him, not by resisting and arguing with him. . .
When the devil throws our sins up to us and declares we deserve death and hell, we ought to speak thus: “I admit that I deserve death and hell. What of it? Does this mean that I shall be sentenced to eternal damnation? By no means. For I know One who suffered and made a satisfaction in my behalf. His name is Jesus Christ, the Son of God. Where he is, there I shall be also.”
Luther: Letters of Spiritual Counsel, trans. and ed., Theodore G. Tappert, 1960, (Vancouver, BC: Regent College Publishing, 2003), 85ff., paragraphing mine.
In review, Luther mentions five pieces of advice:
- Rejoice because temptation testifies of God's mercy to you.
- Do not dwell on the deadly thoughts of the Devil.
- Laugh your adversary to scorn.
- Be around other believers.
- Proclaim the good news of Jesus for you and your salvation.