Theodore Epp emphasizes Paul's testimony in Romans 1:13-17, where Paul expresses his sense of obligation, readiness, and lack of shame regarding the Gospel. Epp highlights that as believers reconciled through Christ, we have a duty to share the message of reconciliation with others. He stresses the importance of being mentally prepared to fulfill God's will and the significance of standing firm in our faith without shame. Ultimately, our faithfulness in this ministry will be a key aspect when we stand before Christ.