How did believers become servants of righteousness?

In Romans 6:17, Paul states, 'But God be thanked that you were the servants of sin, but you have obeyed from the heart that form of doctrine which was delivered unto you.' This obedience is fundamentally about believing in the gospel and trusting in Christ for salvation. It indicates a heart transformation where an individual no longer lives for sin but rather for righteousness. This miraculous change occurs by God’s grace, signifying that true faith results in a life dedicated to living righteously, reflecting the transformative power of the Holy Spirit in the believer's life.