Why are you cast down, O my soul, and why are you in turmoil within me? Hope in God; for I shall again praise him, my salvation and my God. (Psalm 42:11)
We must learn to fight despondency. The fight is a fight of faith in future grace. It is fought by preaching truth to ourselves about God and his promised future.
This is what the psalmist does in Psalm 42. The psalmist preaches to his troubled soul. He scolds himself and argues with himself. And his main argument is future grace: “Hope in God! — Trust in what God will be for you in the future. A day of praise is coming. The presence of the Lord will be all the help you need. And he has promised to be with us forever.”
Martyn Lloyd-Jones believes this issue of preaching truth to ourselves about God’s future grace is all-important in overcoming spiritual depression.
Have you realized that most of your unhappiness in life is due to the fact that you are listening to yourself instead of talking to yourself? Take those thoughts that come to you the moment you wake up in the morning. You have not originated them, but they start talking to you, they bring back the problems of yesterday, etc. Somebody is talking . . . yourself is talking to you!
The battle against despondency is a battle to believe the promises of God. And that belief in God’s future grace comes by hearing the Word. And so preaching to ourselves is at the heart of the battle.