Do everything without grumbling.
Paul is practical as well as philosophical. Christians must never separate knowledge from action. It is one thing to appreciate the good news of the gospel, but another to be committed to the cause. “Whoever wants to be my disciple must deny themselves and take up their cross and follow” (Luke 9:23). We must crush our flesh and the conduct of our natural body. If you know Christ, your actions will make Christ known. Live by the Spirit and strive for righteousness.
Pray that God will guard your mind and guide your movement.