Be diligent to present yourself approved to God as a workman who does not need to be ashamed, accurately handling the word of truth. — 2 Timothy 2:15 (NASB)
To be diligent is to “have or show care and conscientiousness in one’s work or duties.” Its synonyms help paint the picture: industrious, hard-working, assiduous, conscientious, particular, punctilious, meticulous, painstaking, rigorous, careful, thorough, sedulous, earnest.