In the second half of Galatians 4, Paul writes an allegory of the Sarah and Hagar story in which he contrasts competing visions of righteousness. Are we righteous because of what we do? Or are we righteous because of what Jesus has done? Paul reminds us that righteous union with God is already available through Christ’s atoning death, and there is nothing we can do to achieve it other than embracing the gift, the grace, that is being offered.