There's no doubt, though, that fighting the good fight of faith takes energy! But then so do selfpity, anger, unforgiveness, and self-loathing. Each of us must decide where we're going to put our energy when the battle grows fierce.
— Beth Moore
Part of the depressive syndrome is that you are immensely loyal to your interpretation of yourself and your world. If God says you are forgiven in Christ, you create new rules that mandate contrition, penance, and self-loathing. If God says he loves you, you insist it is impossible. There it is: your system is higher than God's.