physical exercise … godliness: Compare with 1 Corinthians 9:24–27 and Colossians 2:23.
holding promise for the present life and for the one to come: Compare with 1 Timothy 4:16, 6:6–8, Mark 10:29–30, and Ephesians 6:2–3.
trustworthy saying: See study note on 1 Timothy 1:15.