A.T. Robertson Commentary 2 Timothy 2:3

"Suffer hardship with [me], as a good soldier of Christ Jesus." — 2 Timothy 2:3 (ASV)

Suffer hardship with me (συνκακοπαθησον). See 1:8 for this verb. The old preacher challenges the young one to share hardship with him for Christ.

As a good soldier (ος καλος στρατιωτης). Paul does not hesitate to use this military metaphor (this word only here for a servant of Christ) with which he is so familiar. He had already used the metaphor in 1 Corinthians 9:7; 2 Corinthians 10:3f.; 1 Timothy 1:18. In Php 2:25 he called Epaphroditus "my fellow-soldier" (συνστρατιωτην μου) as he did Archippus in Phm 1:2.