In this episode, she likens her role to the good shepherd who leaves the flock to find the lost lamb. This is from a parable from Jesus...and I suppose, in a way, she's likening herself to him.
When the episode begins, Seven informs that Captain that she has discovered three crew members who are deficient. One is a hypochondriac that spends more time in sickbay and making excuses than doing his job, another who is smug and morally superior and a final one who always doubts herself. To help them got over their nature, the Captain decides to take the three on a mission in a shuttle. Unfortunately, bad stuff happens and this good shepherd is pushed to the max...as are her three lost lambs.
These losers are so horrible that you wonder how Starfleet would have graduated them from the Academy. Regardless, it is an interesting show. Far fetched that anyone would go nearly as far as the Captain but interesting.