In Galatians 4:21-31, Paul gave an interpretation of the story from the Old Testament about Abraham and the two sons he had, one to Hagar the slave woman, and the other to Sarah his wife. The false teachers in Galatia were perhaps using this story to try to force non-Jewish believers to become Jews. However, Paul showed how the story itself supports his main thesis that both Jews and non-Jews may receive God’s promised blessing through faith, not through law-keeping.
If you have ever compared your life to someone else’s (who hasn’t?), you need to hear Jesus’ reply in John 21:20-25 to Peter’s curiosity...
Jesus announced that the hour had come for him to be glorified, but his glorification would begin with a cross.
God fulfills his plan against human opposition and even through human suffering.