Adam Clarke's Commentary on the Bible

Verse 3 (2 Timothy 2:3)

Endure hardness - He considers a Christian minister under the notion of a soldier, not so much for his continual conflicts with the world, the devil, and the flesh, for these are in a certain sense common to all Christians, but for the hardships and difficulties to which he must be exposed who faithfully preaches the Gospel of Christ.

- Adam Clarke's Commentary on the Bible