“A workman that needeth not to be ashamed.” Be conscientious, diligent, faithful, in the use you make of your time and the talents God has entrusted to you. Give unremitting heed to that precept.

“Whatsoever thy hand findeth to do, do it with thy might” (Ecclesiastes 9:10)

— put your very best into it. Be industrious and assiduous, not careless and slovenly. See how well you can do each thing, and not how quickly. The Greek word for “workman” is also translated “laborer,” and in twentieth-century English might well be rendered “toiler.” The ministry is no place for trifiers and idlers, but for those who are prepared to spend and be spent in the cause of Christ. The preacher ought to work harder than the miner, and to spend more hours per week in his study than does the man of business in his office. A workman is the very opposite of a shirker. If the preacher is to show himself approved unto God and be a workman that needeth not to be ashamed, then he will have to labor while others sleep, and do so until he sweats mentally.

Arthur W. Pink-Interpretation of the Scriptures