When a priest is "installed" as the rector of a church, s/he is required to say this prayer;
This wondrous prayer is a constant reminder that there is so much to do. This is not a duty. This is a joy. Remembering that just being alive is a gift, we cannot help but think that it is in the giving of life to others that great joy is to be found.
Depression is the common cold of the modern world. So is anxiety. I, no less than you, am subject to fits of depression and anxiety, but the best way I know to shake it off is to remember to give away all that I have; not of my money but of my life. This kind of giving is the greatest joy of my life, and is so easily forgotten. A prayer like the one above puts it all back in perspective. It is a wonderful prayer full of grace.
Best of all it is not just for ordained sorts like me, it is for the priesthood of all believers, folks of every way of life, believer and non believer alike, churchman and non-churchman as well. Give your life for others, and you will have joy; boundless joy!