Persecution

Galatians 4:29 NASB
But as at that time he who was born according to the flesh persecuted him who was born according to the Spirit, so it is now also.

This verse mentions two different persons, he who was born according to the flesh and he who was born according to the Spirit.
In lights of what we've just been studying, who are these two guys?
Let's check our cross references to see what we learn. My cross references are Gal. 4:23, Gen. 21:9, and Gal. 5:11.

Galatians 4:23 NASB
But the son by the bondwoman was born according to the flesh, and the son of the free woman through the promise.
Who is the bondwoman?
Who is her son? Use your cross references for this verse if you don't know.
Who is the free woman?
Who is her son?

Instead of just reading Genesis 21:9, read Genesis 21:5-10.
What happened? Who mocked whom?

Read Galatians 5:11.
Who is being persecuted?
Who is doing the persecuting?
With which son, Isaac or Ishmael, would you compare Paul?
With which son would you compare those who were causing problems for Paul and his followers?

Reread Galatians 4:29.
Is this statement true today?
Do those who believe that a person obtains righteousness with God only through his or her own effort persecute those who believe that it is only through God's intervention that a person obtains righteousness?