Why does salvation become more complex to believers as they grow in faith?
Salvation is simple enough for a child to understand when one first enters in, but as a believer grows in faith, he or she begins to realize how profound and complex salvation truly is. Its depths can never be fully plumbed, so growing faith reveals greater complexity without changing the simple entry.
Les explains from Romans chapter 4 that salvation is so profound and complex, yet it is so simple. It is simple when we first enter in, and a child can understand it. But as we grow in our faith as a believer, we begin to realize how complex it all is, and we will never plumb the depths of it. The surrounding context points to Abraham, who responded to God's call by faith, illustrating that salvation begins with simple faith while deeper growth brings a greater realization of its complexity.