What in the World are We Doing?

In the section of Gospel Worship Burroughs speaks of how to approach the sacraments. He speaks of knowledge and understanding which then (the next step he has) leads to cleansing and purging of the heart. Knowledge is fairly simple; such as I know that God is the creator but understanding that concept is I think where we are letting diligence go. My question is why are we not TRUELY understanding the truths of scripture (answer this question individually)? If we TRUELY understood we would seek to cleanse and purge our hearts. So, what are we doing or not doing corporately that is hindering people from understanding the Word?