ζωή means life, and in the New Testament it often means more than biological existence. In the Pastoral Epistles, life is promised in Christ Jesus, displayed as eternal life for those who believe, contrasted with the temporary value of bodily training, grasped in the good fight of faith, and hoped for by heirs justified by grace. Paul does not use ζωή as a vague metaphor for vitality.
It is the life God gives in union with Christ, the life Christ illuminated by abolishing death through the gospel, the life promised by the God who cannot lie, and the life that reorders present conduct because the future is real. The phrase "that which is truly life" in 1 Timothy 6:19 warns readers that possessions, status, and present comfort can imitate life without being life.
ζωή therefore carries promise, resurrection hope, discipleship endurance, and eschatological inheritance.