Growing Pains (Job 42:1-9; Philippians 4:10-13)

It is wonderful that Christians want to grow in grace and grow in conformity to the Lord.  We should all desire to grow in the Lord.  One of the things that is interesting is that Paul knows two things, but he knows these things because he has learned.  How does this learning testify to the growing pains of conforming to the Lord?  What is the benefit of enduring these pains?