Galatians 4:4-7 is one of the great texts of the Bible. It teaches the incarnation of Christ, the two natures of Jesus as God and Man, and that through Jesus as the Son of God and Son of Man, we are made heirs of the heavenly Father.
These four verses are used in our Lutheran Catechism to teach to our youth and adult confirmands why Jesus had to be true God and true Man. I’m sure your pastor drilled the meaning of these verses into you in Catechism class.