We are not off-track and unfit simply because the work often feels like working cursed soil in a desolate land. No, this is the nature of the work itself. Deprivation before honor. Sweat before victory. Toil before the harvest feast. That is the kind of suffering that leads to faithful men who teach others also.
The normal work of discipleship is a type of suffering. This, according to Paul in 2nd Timothy 2:2-7.
 You then, my child, be strengthened by the grace that is in Christ Jesus,  and what you have heard from me in the presence of many witnesses entrust to faithful men, who will be able to teach others also.  Share in suffering as a good soldier of Christ Jesus.  No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him.  An athlete is not crowned unless he competes according to the rules.  It is the hard-working farmer who ought to have the first share of the crops.  Think over what I say, for the Lord will give you understanding in everything.
2 Timothy 2:2-7, ESV
Notice how verse two, which discusses the entrusting of Paul’s message to other faithful men, is immediately followed by an exhortation to share in the suffering of Christ. Along with the local brothers with whom I attended an exegesis and preaching workshop this week, I had been assuming this mention of suffering here referred to persecution. But our cohort leader helped us to see the kind of suffering meant here is illustrated by the three examples of soldier, athlete, and farmer – all examples which emphasize the costliness of hard work and discipline. The costliness of steady, focused, tough labor. Not the costliness of persecution. That was an eye-opener for me, and a timely word.
Yes, elsewhere in 2nd Timothy persecution is mentioned, but the immediate context of these verses suggests that Paul has the suffering of discipline in mind. The kind of discipline and hard work that comes with entrusting the gospel message to faithful men who will entrust it to others also. Like a faithful soldier, a disciplined athlete, a hardworking farmer. This is the suffering of sweat, long hours, and extended seasons of toil.