Anony, lots of us here understand! There's many of us here that have depression. You bet that finding something to say is hard work!
Be kind to yourself and don't beat yourself up about it. Do you see a therapist? If not, you really need to. Maybe you need something to help you out of your depression. It's tough, I know.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.