The subject is poverty of spirit and mourning, as Jesus spoke of in Matthew 5:3-4, and how that compares to the self-esteem movement of our day.
After being a Christian for 40 years, including over 30 years as a pastor, Charles Simeon wrote these words (in the early 1800s):
Does this reflect your heart? Your desire? You may not "be there" yet, but is that the direction you're headed? The direction you want to head? If so, then you're on your way to what Jesus said in Matthew 5:3-4.
One helpful resource related to this is to read the prayers of the Puritans. If you don't have one, get a copy of The Valley of Vision (Arthur Bennett, editor), which you can find in paperback form, or even in a bonded leather for less than $20. It is one of the most important little books that the Christian can have.