Sorry to hear about your depression, I’ve been there myself.

To paraphrase how I understand the quote.

Sometimes doing the morally right thing is hard to do, but it is important to do that as a human. If you haven’t found something important enough for you to take a stand on, to stick to your convictions and defend, then what are you doing?

I’m sure there is something you think is morally correct or morally wrong, like maybe you think harming children is wrong. If that were the case, you should defend children, as it would be good to stop children from being harmed.