Why, my  soul, are you downcast? Why so disturbed with within me? Put your your hope in God, for I will yet praise Him, my Savior and my God.
- Psalm 42:5

When you feel depressed remind yourself of God. He loves you and is for you. Praise God because is is good. That help you have Joy in hard times. Joy can exist even in painful circumstances. He is always by your side. He is the reason to never give up.