In the Bible, "diligence" refers to "haste," (being quick to act), "earnest care," being eager and desirous of acheiving a goal or result. Thus, we are to "study" (give diligence) to show ourselves approved unto God (2 Tim 2:15). Giving all diligence, we are to add to our faith virtue, knowledge, temperance, patience, godliness, brotherly kindness, and love ( 2 Pet 1:5-7). Christians must "give diligence to make (their) calling and election sure" (2 Pet 1:10).
"Cursed be the one who does the Lord's work negligently" ---that is, without diligence (Jer 48:10)! "Thou hast commanded us to keep thy percepts…