Self nurturing to me would be self talk. As depression cuts us down we need to fight back.

Depression: You are so worthless.
Self: I am not worthless, I am not worthless, I am not worthless.
Depression: You are staying in bed today.
Self: No!!! I think I will go for a walk today.
I know how heavy depression can be. But we have to fight back even with the smallest ways possible.