An athlete is not crowned unless he competes according to the rules.
Be strengthened in grace, not as a permission to sloth, but as a command to shake off the flesh's sluggishness. Even the most gifted lose heart midway unless they are constantly aroused and reminded that their strength comes not from themselves but from Christ.
AI summary
Commenting on 2 Timothy 2:1-26
Here Paul encourages Timothy to constancy and perseverance in his work: Be strong in the grace that is in Christ Jesus, Ti2 2:1. Observe, Those who have work to do for God must stir up themselves to do it, and strengthen themselves for it. Being strong in the grace that is in Christ Jesus may be understood in opposition to the weakness of grace.
Commenting on 2 Timothy 2:1-7
And if a man also strive for masteries,.... In the Olympic games, by running, wrestling, leaping, &c. yet is he not crowned; with a corruptible, fading crown, a crown made of herbs and leaves of trees, as parsley, laurel, &c.